cisco-sa-3100_4200_tlsdos-2ynscd54
Vulnerability from csaf_cisco
Published
2025-08-14 16:00
Modified
2025-08-14 16:00
Summary
Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software for Firepower 3100 and 4200 Series TLS 1.3 Cipher Denial of Service Vulnerability

Notes

Summary
A vulnerability in the TLS 1.3 implementation for a specific cipher for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software for Cisco Firepower 3100 and 4200 Series devices could allow an authenticated, remote attacker to consume resources that are associated with incoming TLS 1.3 connections, which eventually could cause the device to stop accepting any new SSL/TLS or VPN requests. This vulnerability is due to the implementation of the TLS 1.3 Cipher TLS_CHACHA20_POLY1305_SHA256. An attacker could exploit this vulnerability by sending a large number of TLS 1.3 connections with the specific TLS 1.3 Cipher TLS_CHACHA20_POLY1305_SHA256. A successful exploit could allow the attacker to cause a denial of service (DoS) condition where no new incoming encrypted connections are accepted. The device must be reloaded to clear this condition. Note: These incoming TLS 1.3 connections include both data traffic and user-management traffic. After the device is in the vulnerable state, no new encrypted connections can be accepted. Cisco has released software updates that address this vulnerability. There are workarounds that address this vulnerability. This advisory is part of the August 2025 release of the Cisco Secure Firewall ASA, Secure FMC, and Secure FTD Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: August 2025 Semiannual Cisco Secure Firewall ASA, Secure FMC, and Secure FTD Software Security Advisory Bundled Publication ["https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-75415"].
Vulnerable Products
This vulnerability affects Cisco Secure Firewall ASA Software and Cisco Secure FTD Software if they are running on a Cisco Secure Firewall 3100 or 4200 Series device that has an SSL listen socket and is configured to allow the TLS 1.3 Cipher TLS_CHACHA20_POLY1305_SHA256. This is not the default configuration. For information about which Cisco software releases are vulnerable, see the Fixed Software ["#fs"] section of this advisory. Determine Whether a Device Can Process TLS Packets To determine whether a device that is running Cisco Secure Firewall ASA Software or Cisco Secure FTD Software can process TLS packets, use the show asp table socket | include SSL command and look for an SSL listening socket on any TCP port. The following example shows the output for a Cisco Secure Firewall ASA device with SSL listen sockets on TCP ports 443 and 8443: ciscoasa# show asp table socket | include SSL SSL 00185038 LISTEN 172.16.0.250:443 0.0.0.0:* SSL 00188638 LISTEN 10.0.0.250:8443 0.0.0.0:* Identify Vulnerable TLS 1.3 Cipher Software Configuration Devices are affected by this vulnerability only if the TLS 1.3 Cipher TLS_CHACHA20_POLY1305_SHA256 is configured. To determine whether a device that is running Cisco Secure Firewall ASA Software or Cisco Secure FTD Software has TLS 1.3 Cipher TLS_CHACHA20_POLY1305_SHA256 configured, use the show running-config all ssl | include TLS_CHACHA20_POLY1305_SHA256 CLI command. If output is returned, as shown in the following example, the device is considered vulnerable: ciscoasa# show running-config all ssl | include TLS_CHACHA20_POLY1305_SHA256 ssl cipher tlsv1.3 custom "TLS_CHACHA20_POLY1305_SHA256"
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products ["#vp"] section of this advisory are known to be affected by this vulnerability. Cisco has confirmed that this vulnerability does not affect Cisco Secure Firewall Management Center (FMC) Software.
Indicators of Compromise
This vulnerability causes devices to run out of Security Context Block (SCB) handles, which are used to process all incoming encrypted connections, including SSL, VPN, TLS, and Internet Key Exchange (IKE). Look for the following two indicators of compromise that could be present if this vulnerability is being exploited: Logged SSL Errors The show ssl errors CLI command could show the following repeating errors: error:1424A044:SSL routines:write_state_machine:internal error@libssl_ext_hndshk_accel.c:87 error:1424A044:SSL routines:write_state_machine:internal error@libssl_ext_hndshk_accel.c:87 SSL Error Counters The show counters | include HANDLE_ALLOC_FAILED counter would be incrementing rapidly, as shown in the following example: ciscoasa# show counters | include HANDLE_ALLOC_FAILED CRYPTO HANDLE_ALLOC_FAILED 56169 Summary Note: When a device is in this failed state, a reboot is required to restore connectivity.
Workarounds
There is a workaround that addresses this vulnerability. Use the no ssl cipher tlsv1.3 custom <cipher list> CLI command to remove the cipher. While this workaround has been deployed and was proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.
Fixed Software
Cisco has released free software updates ["https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#ssu"] that address the vulnerability described in this advisory. Customers with service contracts that entitle them to regular software updates should obtain security fixes through their usual update channels. Customers may only install and expect support for software versions and feature sets for which they have purchased a license. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license: https://www.cisco.com/c/en/us/products/end-user-license-agreement.html ["https://www.cisco.com/c/en/us/products/end-user-license-agreement.html"] Additionally, customers may only download software for which they have a valid license, procured from Cisco directly, or through a Cisco authorized reseller or partner. In most cases this will be a maintenance upgrade to software that was previously purchased. Free security software updates do not entitle customers to a new software license, additional software feature sets, or major revision upgrades. The Cisco Support and Downloads page ["https://www.cisco.com/c/en/us/support/index.html"] on Cisco.com provides information about licensing and downloads. This page can also display customer device support coverage for customers who use the My Devices tool. When considering software upgrades ["https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes"], customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories page ["https://www.cisco.com/go/psirt"], to determine exposure and a complete upgrade solution. In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers. Customers Without Service Contracts Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html ["https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html"] Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade. Cisco Secure Firewall ASA, Secure FMC, and Secure FTD Software To help customers determine their exposure to vulnerabilities in Cisco Secure Firewall ASA, Secure FMC, and Secure FTD Software, Cisco provides the Cisco Software Checker ["https://sec.cloudapps.cisco.com/security/center/softwarechecker.x"]. This tool identifies any Cisco security advisories that impact a specific software release and the earliest release that fixes the vulnerabilities that are described in each advisory (“First Fixed”). If applicable, the tool also returns the earliest release that fixes all the vulnerabilities that are described in all the advisories that the Software Checker identifies (“Combined First Fixed”). To use the tool, go to the Cisco Software Checker ["https://sec.cloudapps.cisco.com/security/center/softwarechecker.x"] page and follow the instructions. Alternatively, use the following form to search for vulnerabilities that affect a specific software release. To use the form, follow these steps: Choose which advisories the tool will search—all advisories, only advisories with a Critical or High Security Impact Rating (SIR) ["https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#asr"], or only this advisory. Choose the appropriate software. Choose the appropriate platform. Enter a release number—for example, 9.16.2.11 for Cisco Secure Firewall ASA Software or 6.6.7 for Cisco Secure FTD Software. Click Check. Only this advisoryAll Critical and High advisoriesAll advisoriesCisco ASA SoftwareCisco FMC SoftwareCisco FTD SoftwareAny Platform3000 Series Industrial Security Appliances (ISA)ASA 5500-X Series FirewallsASA Service ModuleAdaptive Security Virtual Appliance (ASAv)Firepower 1000 SeriesFirepower 2100 SeriesFirepower 4100 SeriesFirepower 9000 SeriesFirepower NGFW VirtualSecure Firewall 3100 SeriesFirepower Management Center Appliances For instructions on upgrading a Cisco Secure FTD device, see the appropriate Cisco Secure FMC upgrade guide ["https://www.cisco.com/c/en/us/support/security/defense-center/products-installation-guides-list.html"]. Additional Resources For help determining the best Cisco Secure Firewall ASA, Secure FMC, or Secure FTD Software release, see the following Recommended Releases documents. If a security advisory recommends a later release, Cisco recommends following the advisory guidance. Cisco Secure Firewall ASA Compatibility ["https://www.cisco.com/c/en/us/td/docs/security/asa/compatibility/asamatrx.html"] Cisco Secure Firewall ASA Upgrade Guide ["https://www.cisco.com/c/en/us/td/docs/security/asa/upgrade/asa-upgrade/planning.html"] Cisco Secure Firewall Threat Defense Compatibility Guide ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/compatibility/threat-defense-compatibility.html"]
Vulnerability Policy
To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy ["http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html"]. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
Exploitation and Public Announcements
The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
Source
This vulnerability was found during the resolution of a Cisco TAC support case.
Legal Disclaimer
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME. A standalone copy or paraphrase of the text of this document that omits the distribution URL is an uncontrolled copy and may lack important information or contain factual errors. The information in this document is intended for end users of Cisco products.


To clipboard 

{
  "document": {
    "acknowledgments": [
      {
        "summary": "This vulnerability was found during the resolution of a Cisco TAC support case."
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "notes": [
      {
        "category": "summary",
        "text": "A vulnerability in the TLS 1.3 implementation for a specific cipher for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software for Cisco Firepower 3100 and 4200 Series devices could allow an authenticated, remote attacker to consume resources that are associated with incoming TLS 1.3 connections, which eventually could cause the device to stop accepting any new SSL/TLS or VPN requests.\r\n\r\nThis vulnerability is due to the implementation of the TLS 1.3 Cipher TLS_CHACHA20_POLY1305_SHA256. An attacker could exploit this vulnerability by sending a large number of TLS 1.3 connections with the specific TLS 1.3 Cipher TLS_CHACHA20_POLY1305_SHA256. A successful exploit could allow the attacker to cause a denial of service (DoS) condition where no new incoming encrypted connections are accepted. The device must be reloaded to clear this condition.\r\n\r\nNote: These incoming TLS 1.3 connections include both data traffic and user-management traffic. After the device is in the vulnerable state, no new encrypted connections can be accepted.\r\n\r\nCisco has released software updates that address this vulnerability. There are workarounds that address this vulnerability.\r\n\r\n\r\n\r\nThis advisory is part of the August 2025 release of the Cisco Secure Firewall ASA, Secure FMC, and Secure FTD Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: August 2025 Semiannual Cisco Secure Firewall ASA, Secure FMC, and Secure FTD Software Security Advisory Bundled Publication [\"https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-75415\"].",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "This vulnerability affects Cisco Secure Firewall ASA Software and Cisco Secure FTD Software if they are running on a Cisco Secure Firewall 3100 or 4200 Series device that has an SSL listen socket and is configured to allow the TLS 1.3 Cipher TLS_CHACHA20_POLY1305_SHA256. This is not the default configuration.\r\n\r\nFor information about which Cisco software releases are vulnerable, see the Fixed Software [\"#fs\"] section of this advisory.\r\n  Determine Whether a Device Can Process TLS Packets\r\nTo determine whether a device that is running Cisco Secure Firewall ASA Software or Cisco Secure FTD Software can process TLS packets, use the show asp table socket | include SSL command and look for an SSL listening socket on any TCP port. The following example shows the output for a Cisco Secure Firewall ASA device with SSL listen sockets on TCP ports 443 and 8443:\r\n\r\n\r\nciscoasa# show asp table socket | include SSL\r\nSSL       00185038  LISTEN     172.16.0.250:443    0.0.0.0:*\r\nSSL       00188638  LISTEN      10.0.0.250:8443    0.0.0.0:*\r\n\r\n   Identify Vulnerable TLS 1.3 Cipher Software Configuration\r\nDevices are affected by this vulnerability only if the TLS 1.3 Cipher TLS_CHACHA20_POLY1305_SHA256 is configured. To determine whether a device that is running Cisco Secure Firewall ASA Software or Cisco Secure FTD Software has TLS 1.3 Cipher TLS_CHACHA20_POLY1305_SHA256 configured, use the show running-config all ssl | include TLS_CHACHA20_POLY1305_SHA256 CLI command. If output is returned, as shown in the following example, the device is considered vulnerable:\r\n\r\n\r\nciscoasa# show running-config all ssl | include TLS_CHACHA20_POLY1305_SHA256\r\nssl cipher tlsv1.3 custom \"TLS_CHACHA20_POLY1305_SHA256\"",
        "title": "Vulnerable Products"
      },
      {
        "category": "general",
        "text": "Only products listed in the Vulnerable Products [\"#vp\"] section of this advisory are known to be affected by this vulnerability.\r\n\r\nCisco has confirmed that this vulnerability does not affect Cisco Secure Firewall Management Center (FMC) Software.",
        "title": "Products Confirmed Not Vulnerable"
      },
      {
        "category": "general",
        "text": "This vulnerability causes devices to run out of Security Context Block (SCB) handles, which are used to process all incoming encrypted connections, including SSL, VPN, TLS, and Internet Key Exchange (IKE). Look for the following two indicators of compromise that could be present if this vulnerability is being exploited:\r\n\r\nLogged SSL Errors\r\n\r\nThe show ssl errors CLI command could show the following repeating errors:\r\n\r\n\r\nerror:1424A044:SSL routines:write_state_machine:internal error@libssl_ext_hndshk_accel.c:87\r\nerror:1424A044:SSL routines:write_state_machine:internal error@libssl_ext_hndshk_accel.c:87\r\n\r\nSSL Error Counters\r\n\r\nThe show counters | include HANDLE_ALLOC_FAILED counter would be incrementing rapidly, as shown in the following example:\r\n\r\n\r\nciscoasa# show counters | include HANDLE_ALLOC_FAILED\r\nCRYPTO       HANDLE_ALLOC_FAILED                           56169   Summary\r\n\r\nNote: When a device is in this failed state, a reboot is required to restore connectivity.",
        "title": "Indicators of Compromise"
      },
      {
        "category": "general",
        "text": "There is a workaround that addresses this vulnerability. Use the no ssl cipher tlsv1.3 custom \u003ccipher list\u003e CLI command to remove the cipher.\r\n\r\nWhile this workaround has been deployed and was proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.",
        "title": "Workarounds"
      },
      {
        "category": "general",
        "text": "Cisco has released free software updates [\"https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#ssu\"] that address the vulnerability described in this advisory. Customers with service contracts that entitle them to regular software updates should obtain security fixes through their usual update channels.\r\n\r\nCustomers may only install and expect support for software versions and feature sets for which they have purchased a license. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license:\r\nhttps://www.cisco.com/c/en/us/products/end-user-license-agreement.html [\"https://www.cisco.com/c/en/us/products/end-user-license-agreement.html\"]\r\n\r\nAdditionally, customers may only download software for which they have a valid license, procured from Cisco directly, or through a Cisco authorized reseller or partner. In most cases this will be a maintenance upgrade to software that was previously purchased. Free security software updates do not entitle customers to a new software license, additional software feature sets, or major revision upgrades.\r\n\r\nThe Cisco Support and Downloads page [\"https://www.cisco.com/c/en/us/support/index.html\"] on Cisco.com provides information about licensing and downloads. This page can also display customer device support coverage for customers who use the My Devices tool.\r\n\r\nWhen considering software upgrades [\"https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes\"], customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories page [\"https://www.cisco.com/go/psirt\"], to determine exposure and a complete upgrade solution.\r\n\r\nIn all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.\r\nCustomers Without Service Contracts\r\nCustomers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html [\"https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html\"]\r\n\r\nCustomers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade.\r\nCisco Secure Firewall ASA, Secure FMC, and Secure FTD Software\r\nTo help customers determine their exposure to vulnerabilities in Cisco Secure Firewall ASA, Secure FMC, and Secure FTD Software, Cisco provides the Cisco Software Checker [\"https://sec.cloudapps.cisco.com/security/center/softwarechecker.x\"]. This tool identifies any Cisco security advisories that impact a specific software release and the earliest release that fixes the vulnerabilities that are described in each advisory (\u201cFirst Fixed\u201d). If applicable, the tool also returns the earliest release that fixes all the vulnerabilities that are described in all the advisories that the Software Checker identifies (\u201cCombined First Fixed\u201d).\r\n\r\nTo use the tool, go to the Cisco Software Checker [\"https://sec.cloudapps.cisco.com/security/center/softwarechecker.x\"] page and follow the instructions. Alternatively, use the following form to search for vulnerabilities that affect a specific software release. To use the form, follow these steps:\r\n\r\nChoose which advisories the tool will search\u2014all advisories, only advisories with a Critical or High Security Impact Rating (SIR) [\"https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#asr\"], or only this advisory.\r\nChoose the appropriate software.\r\nChoose the appropriate platform.\r\nEnter a release number\u2014for example, 9.16.2.11 for Cisco Secure Firewall ASA Software or 6.6.7 for Cisco Secure FTD Software.\r\nClick Check.\r\n  Only this advisoryAll Critical and High advisoriesAll advisoriesCisco ASA SoftwareCisco FMC SoftwareCisco FTD SoftwareAny Platform3000 Series Industrial Security Appliances (ISA)ASA 5500-X Series FirewallsASA Service ModuleAdaptive Security Virtual Appliance (ASAv)Firepower 1000 SeriesFirepower 2100 SeriesFirepower 4100 SeriesFirepower 9000 SeriesFirepower NGFW VirtualSecure Firewall 3100 SeriesFirepower Management Center Appliances\r\n\r\n\r\n\r\n\r\nFor instructions on upgrading a Cisco Secure FTD device, see the appropriate Cisco Secure FMC upgrade guide [\"https://www.cisco.com/c/en/us/support/security/defense-center/products-installation-guides-list.html\"].\r\n\r\n Additional Resources\r\nFor help determining the best Cisco Secure Firewall ASA, Secure FMC, or Secure FTD Software release, see the following Recommended Releases documents. If a security advisory recommends a later release, Cisco recommends following the advisory guidance.\r\n\r\nCisco Secure Firewall ASA Compatibility [\"https://www.cisco.com/c/en/us/td/docs/security/asa/compatibility/asamatrx.html\"]\r\nCisco Secure Firewall ASA Upgrade Guide [\"https://www.cisco.com/c/en/us/td/docs/security/asa/upgrade/asa-upgrade/planning.html\"]\r\nCisco Secure Firewall Threat Defense Compatibility Guide [\"https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/compatibility/threat-defense-compatibility.html\"]",
        "title": "Fixed Software"
      },
      {
        "category": "general",
        "text": "To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy [\"http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html\"]. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.",
        "title": "Vulnerability Policy"
      },
      {
        "category": "general",
        "text": "The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.",
        "title": "Exploitation and Public Announcements"
      },
      {
        "category": "general",
        "text": "This vulnerability was found during the resolution of a Cisco TAC support case.",
        "title": "Source"
      },
      {
        "category": "legal_disclaimer",
        "text": "THIS DOCUMENT IS PROVIDED ON AN \"AS IS\" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.\r\n\r\nA standalone copy or paraphrase of the text of this document that omits the distribution URL is an uncontrolled copy and may lack important information or contain factual errors. The information in this document is intended for end users of Cisco products.",
        "title": "Legal Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "psirt@cisco.com",
      "issuing_authority": "Cisco PSIRT",
      "name": "Cisco",
      "namespace": "https://wwww.cisco.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software for Firepower 3100 and 4200 Series TLS 1.3 Cipher Denial of Service Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-3100_4200_tlsdos-2yNSCd54"
      },
      {
        "category": "external",
        "summary": "Cisco Event Response: August 2025 Cisco Secure Firewall ASA, Secure FMC, and Secure FTD Software Security Advisory Bundled Publication",
        "url": "https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-75415"
      },
      {
        "category": "external",
        "summary": "Cisco Security Vulnerability Policy",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html"
      },
      {
        "category": "external",
        "summary": "free software updates",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#ssu"
      },
      {
        "category": "external",
        "summary": "https://www.cisco.com/c/en/us/products/end-user-license-agreement.html",
        "url": "https://www.cisco.com/c/en/us/products/end-user-license-agreement.html"
      },
      {
        "category": "external",
        "summary": "Cisco Support and Downloads page",
        "url": "https://www.cisco.com/c/en/us/support/index.html"
      },
      {
        "category": "external",
        "summary": "considering software upgrades",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes"
      },
      {
        "category": "external",
        "summary": "Cisco Security Advisories page",
        "url": "https://www.cisco.com/go/psirt"
      },
      {
        "category": "external",
        "summary": "https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html",
        "url": "https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html"
      },
      {
        "category": "external",
        "summary": "Cisco Software Checker",
        "url": "https://sec.cloudapps.cisco.com/security/center/softwarechecker.x"
      },
      {
        "category": "external",
        "summary": "Security Impact Rating (SIR)",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#asr"
      },
      {
        "category": "external",
        "summary": "Cisco Secure FMC upgrade guide",
        "url": "https://www.cisco.com/c/en/us/support/security/defense-center/products-installation-guides-list.html"
      },
      {
        "category": "external",
        "summary": "Cisco Secure Firewall ASA Compatibility",
        "url": "https://www.cisco.com/c/en/us/td/docs/security/asa/compatibility/asamatrx.html"
      },
      {
        "category": "external",
        "summary": "Cisco Secure Firewall ASA Upgrade Guide",
        "url": "https://www.cisco.com/c/en/us/td/docs/security/asa/upgrade/asa-upgrade/planning.html"
      },
      {
        "category": "external",
        "summary": "Cisco Secure Firewall Threat Defense Compatibility Guide",
        "url": "https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/compatibility/threat-defense-compatibility.html"
      },
      {
        "category": "external",
        "summary": "Security Vulnerability Policy",
        "url": "http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html"
      }
    ],
    "title": "Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software for Firepower 3100 and 4200 Series TLS 1.3 Cipher Denial of Service Vulnerability",
    "tracking": {
      "current_release_date": "2025-08-14T16:00:00+00:00",
      "generator": {
        "date": "2025-08-14T15:55:08+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-3100_4200_tlsdos-2yNSCd54",
      "initial_release_date": "2025-08-14T16:00:00+00:00",
      "revision_history": [
        {
          "date": "2025-08-14T15:53:42+00:00",
          "number": "1.0.0",
          "summary": "Initial public release."
        }
      ],
      "status": "final",
      "version": "1.0.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "9.20.1",
                    "product": {
                      "name": "9.20.1",
                      "product_id": "CSAFPID-300766"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "9.20.1.5",
                    "product": {
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                  },
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                    "category": "service_pack",
                    "name": "9.20.2",
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                    "category": "service_pack",
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                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "9.20.2.21",
                    "product": {
                      "name": "9.20.2.21",
                      "product_id": "CSAFPID-301717"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "9.20.2.22",
                    "product": {
                      "name": "9.20.2.22",
                      "product_id": "CSAFPID-301753"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "9.20.3",
                    "product": {
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                      "product_id": "CSAFPID-302685"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "9.20.3.4",
                    "product": {
                      "name": "9.20.3.4",
                      "product_id": "CSAFPID-302892"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "9.20.3.7",
                    "product": {
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                    }
                  }
                ],
                "category": "product_version",
                "name": "9.20"
              },
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                "branches": [
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                    "category": "service_pack",
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                      "product_id": "CSAFPID-302876"
                    }
                  }
                ],
                "category": "product_version",
                "name": "9.22"
              }
            ],
            "category": "product_family",
            "name": "Cisco Adaptive Security Appliance (ASA) Software"
          },
          {
            "branches": [
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "7.4.0",
                    "product": {
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                      "product_id": "CSAFPID-300737"
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                    "category": "service_pack",
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                    }
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                    "category": "service_pack",
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                    }
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                    "category": "service_pack",
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                      "product_id": "CSAFPID-302686"
                    }
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                  {
                    "category": "service_pack",
                    "name": "7.4.2.1",
                    "product": {
                      "name": "7.4.2.1",
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                    }
                  }
                ],
                "category": "product_version",
                "name": "7.4"
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                "branches": [
                  {
                    "category": "service_pack",
                    "name": "7.6.0",
                    "product": {
                      "name": "7.6.0",
                      "product_id": "CSAFPID-302870"
                    }
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                ],
                "category": "product_version",
                "name": "7.6"
              }
            ],
            "category": "product_family",
            "name": "Cisco Firepower Threat Defense Software"
          },
          {
            "category": "product_name",
            "name": "Cisco Secure Firewall 3100 Series",
            "product": {
              "name": "Cisco Secure Firewall 3100 Series",
              "product_id": "CSAFPID-286865"
            }
          },
          {
            "category": "product_name",
            "name": "Cisco Secure Firewall 4200 Series",
            "product": {
              "name": "Cisco Secure Firewall 4200 Series",
              "product_id": "CSAFPID-300754"
            }
          }
        ],
        "category": "vendor",
        "name": "Cisco"
      }
    ],
    "relationships": [
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        "category": "installed_on",
        "full_product_name": {
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        "category": "installed_on",
        "full_product_name": {
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        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Adaptive Security Appliance (ASA) Software 9.20.2.21 when installed on Cisco Secure Firewall 4200 Series",
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        "category": "installed_on",
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        "category": "installed_on",
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          "name": "Cisco Adaptive Security Appliance (ASA) Software 9.20.3 when installed on Cisco Secure Firewall 4200 Series",
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        },
        "product_reference": "CSAFPID-302685",
        "relates_to_product_reference": "CSAFPID-300754"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Adaptive Security Appliance (ASA) Software 9.20.3.4 when installed on Cisco Secure Firewall 3100 Series",
          "product_id": "CSAFPID-302892:286865"
        },
        "product_reference": "CSAFPID-302892",
        "relates_to_product_reference": "CSAFPID-286865"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Adaptive Security Appliance (ASA) Software 9.20.3.4 when installed on Cisco Secure Firewall 4200 Series",
          "product_id": "CSAFPID-302892:300754"
        },
        "product_reference": "CSAFPID-302892",
        "relates_to_product_reference": "CSAFPID-300754"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Adaptive Security Appliance (ASA) Software 9.20.3.7 when installed on Cisco Secure Firewall 3100 Series",
          "product_id": "CSAFPID-302992:286865"
        },
        "product_reference": "CSAFPID-302992",
        "relates_to_product_reference": "CSAFPID-286865"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Adaptive Security Appliance (ASA) Software 9.20.3.7 when installed on Cisco Secure Firewall 4200 Series",
          "product_id": "CSAFPID-302992:300754"
        },
        "product_reference": "CSAFPID-302992",
        "relates_to_product_reference": "CSAFPID-300754"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Adaptive Security Appliance (ASA) Software 9.22.1.1 when installed on Cisco Secure Firewall 3100 Series",
          "product_id": "CSAFPID-302876:286865"
        },
        "product_reference": "CSAFPID-302876",
        "relates_to_product_reference": "CSAFPID-286865"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Adaptive Security Appliance (ASA) Software 9.22.1.1 when installed on Cisco Secure Firewall 4200 Series",
          "product_id": "CSAFPID-302876:300754"
        },
        "product_reference": "CSAFPID-302876",
        "relates_to_product_reference": "CSAFPID-300754"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Firepower Threat Defense Software 7.4.0 when installed on Cisco Secure Firewall 4200 Series",
          "product_id": "CSAFPID-300737:300754"
        },
        "product_reference": "CSAFPID-300737",
        "relates_to_product_reference": "CSAFPID-300754"
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      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Firepower Threat Defense Software 7.4.1 when installed on Cisco Secure Firewall 3100 Series",
          "product_id": "CSAFPID-301109:286865"
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        "product_reference": "CSAFPID-301109",
        "relates_to_product_reference": "CSAFPID-286865"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Firepower Threat Defense Software 7.4.1 when installed on Cisco Secure Firewall 4200 Series",
          "product_id": "CSAFPID-301109:300754"
        },
        "product_reference": "CSAFPID-301109",
        "relates_to_product_reference": "CSAFPID-300754"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Firepower Threat Defense Software 7.4.1.1 when installed on Cisco Secure Firewall 3100 Series",
          "product_id": "CSAFPID-301606:286865"
        },
        "product_reference": "CSAFPID-301606",
        "relates_to_product_reference": "CSAFPID-286865"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Firepower Threat Defense Software 7.4.1.1 when installed on Cisco Secure Firewall 4200 Series",
          "product_id": "CSAFPID-301606:300754"
        },
        "product_reference": "CSAFPID-301606",
        "relates_to_product_reference": "CSAFPID-300754"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Firepower Threat Defense Software 7.4.2 when installed on Cisco Secure Firewall 3100 Series",
          "product_id": "CSAFPID-302686:286865"
        },
        "product_reference": "CSAFPID-302686",
        "relates_to_product_reference": "CSAFPID-286865"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Firepower Threat Defense Software 7.4.2 when installed on Cisco Secure Firewall 4200 Series",
          "product_id": "CSAFPID-302686:300754"
        },
        "product_reference": "CSAFPID-302686",
        "relates_to_product_reference": "CSAFPID-300754"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Firepower Threat Defense Software 7.4.2.1 when installed on Cisco Secure Firewall 3100 Series",
          "product_id": "CSAFPID-302966:286865"
        },
        "product_reference": "CSAFPID-302966",
        "relates_to_product_reference": "CSAFPID-286865"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Firepower Threat Defense Software 7.4.2.1 when installed on Cisco Secure Firewall 4200 Series",
          "product_id": "CSAFPID-302966:300754"
        },
        "product_reference": "CSAFPID-302966",
        "relates_to_product_reference": "CSAFPID-300754"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Firepower Threat Defense Software 7.6.0 when installed on Cisco Secure Firewall 3100 Series",
          "product_id": "CSAFPID-302870:286865"
        },
        "product_reference": "CSAFPID-302870",
        "relates_to_product_reference": "CSAFPID-286865"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Firepower Threat Defense Software 7.6.0 when installed on Cisco Secure Firewall 4200 Series",
          "product_id": "CSAFPID-302870:300754"
        },
        "product_reference": "CSAFPID-302870",
        "relates_to_product_reference": "CSAFPID-300754"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2025-20127",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCwm91176"
        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-300737:300754",
          "CSAFPID-301109:286865",
          "CSAFPID-301109:300754",
          "CSAFPID-301606:286865",
          "CSAFPID-301606:300754",
          "CSAFPID-302686:286865",
          "CSAFPID-302686:300754",
          "CSAFPID-302870:286865",
          "CSAFPID-302870:300754",
          "CSAFPID-302966:286865",
          "CSAFPID-302966:300754",
          "CSAFPID-300766:300754",
          "CSAFPID-300898:300754",
          "CSAFPID-301114:286865",
          "CSAFPID-301114:300754",
          "CSAFPID-301294:286865",
          "CSAFPID-301294:300754",
          "CSAFPID-301717:286865",
          "CSAFPID-301717:300754",
          "CSAFPID-301753:286865",
          "CSAFPID-301753:300754",
          "CSAFPID-302685:286865",
          "CSAFPID-302685:300754",
          "CSAFPID-302876:286865",
          "CSAFPID-302876:300754",
          "CSAFPID-302892:286865",
          "CSAFPID-302892:300754",
          "CSAFPID-302992:286865",
          "CSAFPID-302992:300754"
        ]
      },
      "release_date": "2025-08-14T16:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-300737:300754",
            "CSAFPID-301109:286865",
            "CSAFPID-301109:300754",
            "CSAFPID-301606:286865",
            "CSAFPID-301606:300754",
            "CSAFPID-302686:286865",
            "CSAFPID-302686:300754",
            "CSAFPID-302870:286865",
            "CSAFPID-302870:300754",
            "CSAFPID-302966:286865",
            "CSAFPID-302966:300754",
            "CSAFPID-300766:300754",
            "CSAFPID-300898:300754",
            "CSAFPID-301114:286865",
            "CSAFPID-301114:300754",
            "CSAFPID-301294:286865",
            "CSAFPID-301294:300754",
            "CSAFPID-301717:286865",
            "CSAFPID-301717:300754",
            "CSAFPID-301753:286865",
            "CSAFPID-301753:300754",
            "CSAFPID-302685:286865",
            "CSAFPID-302685:300754",
            "CSAFPID-302876:286865",
            "CSAFPID-302876:300754",
            "CSAFPID-302892:286865",
            "CSAFPID-302892:300754",
            "CSAFPID-302992:286865",
            "CSAFPID-302992:300754"
          ],
          "url": "https://software.cisco.com"
        },
        {
          "category": "workaround",
          "details": "There is a workaround that addresses this vulnerability. Use the no ssl cipher tlsv1.3 custom \u003ccipher list\u003e CLI command to remove the cipher.\r\n\r\nWhile this workaround has been deployed and was proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.",
          "product_ids": [
            "CSAFPID-300737:300754",
            "CSAFPID-301109:286865",
            "CSAFPID-301109:300754",
            "CSAFPID-301606:286865",
            "CSAFPID-301606:300754",
            "CSAFPID-302686:286865",
            "CSAFPID-302686:300754",
            "CSAFPID-302870:286865",
            "CSAFPID-302870:300754",
            "CSAFPID-302966:286865",
            "CSAFPID-302966:300754",
            "CSAFPID-300766:300754",
            "CSAFPID-300898:300754",
            "CSAFPID-301114:286865",
            "CSAFPID-301114:300754",
            "CSAFPID-301294:286865",
            "CSAFPID-301294:300754",
            "CSAFPID-301717:286865",
            "CSAFPID-301717:300754",
            "CSAFPID-301753:286865",
            "CSAFPID-301753:300754",
            "CSAFPID-302685:286865",
            "CSAFPID-302685:300754",
            "CSAFPID-302876:286865",
            "CSAFPID-302876:300754",
            "CSAFPID-302892:286865",
            "CSAFPID-302892:300754",
            "CSAFPID-302992:286865",
            "CSAFPID-302992:300754"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.7,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-300737:300754",
            "CSAFPID-301109:286865",
            "CSAFPID-301109:300754",
            "CSAFPID-301606:286865",
            "CSAFPID-301606:300754",
            "CSAFPID-302686:286865",
            "CSAFPID-302686:300754",
            "CSAFPID-302870:286865",
            "CSAFPID-302870:300754",
            "CSAFPID-302966:286865",
            "CSAFPID-302966:300754",
            "CSAFPID-300766:300754",
            "CSAFPID-300898:300754",
            "CSAFPID-301114:286865",
            "CSAFPID-301114:300754",
            "CSAFPID-301294:286865",
            "CSAFPID-301294:300754",
            "CSAFPID-301717:286865",
            "CSAFPID-301717:300754",
            "CSAFPID-301753:286865",
            "CSAFPID-301753:300754",
            "CSAFPID-302685:286865",
            "CSAFPID-302685:300754",
            "CSAFPID-302876:286865",
            "CSAFPID-302876:300754",
            "CSAFPID-302892:286865",
            "CSAFPID-302892:300754",
            "CSAFPID-302992:286865",
            "CSAFPID-302992:300754"
          ]
        }
      ],
      "title": "Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software for Firepower 3100 and 4200 Series TLS Cipher Denial of Service Vulnerability"
    }
  ]
}


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