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MSRC compact vulnerability detail

CVE-2025-49735 · Windows KDC Proxy Service (KPSSVC) Remote Code Execution Vulnerability

Use after free in Windows KDC Proxy Service (KPSSVC) allows an unauthorized attacker to execute code over a network.

Severity
Critical
Impact
Remote Code Execution
CVSS
8.1 base · 7.1 temporal
Release
2025-07-08
Signals
Windows KDC Proxy Service (KPSSVC) Remote Code Execution Exploited: No Publicly disclosed: No Exploitability: Exploitation More Likely
CWE
CWE-416: Use After Free
Patch Diff
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Description
Use after free in Windows KDC Proxy Service (KPSSVC) allows an unauthorized attacker to execute code over a network.
FAQ / Articles
Windows KDC Proxy Service (KPSSVC) Remote Code Execution Vulnerability
Use after free in Windows KDC Proxy Service (KPSSVC) allows an unauthorized attacker to execute code over a network.
Windows KDC Proxy Service (KPSSVC) Remote Code Execution Vulnerability
Use after free in Windows KDC Proxy Service (KPSSVC) allows an unauthorized attacker to execute code over a network.
FAQ
Are all Windows Servers affected by this vulnerability? 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.
FAQ
According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability? Successful exploitation of this vulnerability requires an attacker to win a race condition.
FAQ
How could an attacker exploit this vulnerability? 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.