msrc_cve-2025-29956
Vulnerability from csaf_microsoft
Published
2025-05-13 07:00
Modified
2025-05-13 07:00
Summary
Windows SMB Information Disclosure Vulnerability

Notes

Additional Resources
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
Disclaimer
The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
Customer Action
Required. The vulnerability documented by this CVE requires customer action to resolve.



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  "vulnerabilities": [
    {
      "cve": "CVE-2025-29956",
      "cwe": {
        "id": "CWE-126",
        "name": "Buffer Over-read"
      },
      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        },
        {
          "category": "faq",
          "text": "The attack requires to trick a user to open an SMB share folder that is hosted on the attacker-controlled system. Windows Explorer has to automatically register for directory change notification after opening the share folder.",
          "title": "According to the CVSS metric, user interaction is required (UI:R) and privileges required is low (PR:L). What does that mean for this vulnerability?"
        },
        {
          "category": "faq",
          "text": "An attacker who successfully exploited this vulnerability could potentially read small portions of heap memory.",
          "title": "What type of information could be disclosed by this vulnerability?"
        },
        {
          "category": "faq",
          "text": "To successfully exploit the vulnerability, an attacker would need to direct a user to connect to the malicious SMB server to retrieve some data as part of an OS API call.",
          "title": "How could an attacker exploit the vulnerability?"
        },
        {
          "category": "faq",
          "text": "For this vulnerability, it is out of attacker\u0027s control to trigger the OOB read buffer to be sent back to the attacker-controlled system.",
          "title": "According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?"
        },
        {
          "category": "faq",
          "text": "There is a high likelihood that the Out-Of-Bounds (OOB) read data results in a crash in Windows Explorer. Every time the SMB client sends the OOB read data to the remote SMB server and a crash does not occur, it would contain several bytes of random user mode heap memory.",
          "title": "According to the CVSS metrics, successful exploitation of this vulnerability could lead to a high loss of confidentiality (C:H), no effect on integrity (I:N) and some loss of availability (A:L). What does that mean for this vulnerability?"
        }
      ],
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          "category": "self",
          "summary": "CVE-2025-29956 Windows SMB Information Disclosure Vulnerability - HTML",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-29956"
        },
        {
          "category": "self",
          "summary": "CVE-2025-29956 Windows SMB Information Disclosure Vulnerability - CSAF",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "environmentalsScore": 0.0,
            "exploitCodeMaturity": "UNPROVEN",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "UNCHANGED",
            "temporalScore": 4.7,
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:L/E:U/RL:O/RC:C",
            "version": "3.1"
          },
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            "3",
            "4",
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            "6",
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            "31",
            "32",
            "33",
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            "35",
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        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Information Disclosure"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Unlikely"
        }
      ],
      "title": "Windows SMB Information Disclosure Vulnerability"
    }
  ]
}


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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
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