msrc_cve-2025-49735
Vulnerability from csaf_microsoft
Published
2025-07-08 07:00
Modified
2025-07-17 07:00
Summary
Windows KDC Proxy Service (KPSSVC) Remote Code Execution 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.


To clipboard 

{
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    "acknowledgments": [
      {
        "names": [
          "\u028c!\u0254\u22a5ojv with Kunlun Lab"
        ]
      }
    ],
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    "csaf_version": "2.0",
    "distribution": {
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      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
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        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "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.",
        "title": "Disclaimer"
      },
      {
        "category": "general",
        "text": "Required. The vulnerability documented by this CVE requires customer action to resolve.",
        "title": "Customer Action"
      }
    ],
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      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
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        "category": "self",
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      },
      {
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        "summary": "CVE-2025-49735 Windows KDC Proxy Service (KPSSVC) Remote Code Execution Vulnerability - CSAF",
        "url": "https://msrc.microsoft.com/csaf/advisories/2025/msrc_cve-2025-49735.json"
      },
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        "url": "https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1"
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      {
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        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
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    ],
    "title": "Windows KDC Proxy Service (KPSSVC) Remote Code Execution Vulnerability",
    "tracking": {
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      "generator": {
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        },
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  "vulnerabilities": [
    {
      "cve": "CVE-2025-49735",
      "cwe": {
        "id": "CWE-416",
        "name": "Use After Free"
      },
      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        },
        {
          "category": "faq",
          "text": "This vulnerability only affects Windows Servers that are configured as a [MS-KKDCP]: Kerberos Key Distribution Center (KDC) Proxy Protocol server. Domain controllers are not affected.",
          "title": "Are all Windows Servers affected by this vulnerability?"
        },
        {
          "category": "faq",
          "text": "Successful exploitation of this vulnerability requires an attacker to win a race condition.",
          "title": "According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?"
        },
        {
          "category": "faq",
          "text": "An unauthenticated attacker could use a specially crafted application to leverage a cryptographic protocol vulnerability in Kerberos Key Distribution Center Proxy Service to perform remote code execution against the target.",
          "title": "How could an attacker exploit this vulnerability?"
        }
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        },
        {
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          "summary": "CVE-2025-49735 Windows KDC Proxy Service (KPSSVC) Remote Code Execution Vulnerability - CSAF",
          "url": "https://msrc.microsoft.com/csaf/advisories/2025/msrc_cve-2025-49735.json"
        }
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          "details": "6.2.9200.25522:Monthly Rollup:https://support.microsoft.com/help/5061059",
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      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "environmentalsScore": 0.0,
            "exploitCodeMaturity": "UNPROVEN",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "UNCHANGED",
            "temporalScore": 7.1,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C",
            "version": "3.1"
          },
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            "8",
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            "10",
            "11",
            "12",
            "13"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Remote Code Execution"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation More Likely"
        }
      ],
      "title": "Windows KDC Proxy Service (KPSSVC) Remote Code Execution Vulnerability"
    }
  ]
}


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