Time-of-check Time-of-use (TOCTOU) Race Condition in Windows Server and Windows - CVE-2025-21191
Published: April 9, 2025
Vulnerability identifier: #VU107257
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-21191
CWE-ID: CWE-367
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Microsoft
Affected software:
Windows Server
Windows
Windows Server
Windows
Detailed vulnerability description
The vulnerability allows a local user to compromise the target system.
The vulnerability exists due to a time-of-check, time-of-use (TOCTOU) race condition in Windows Local Security Authority (LSA). A local user can gain elevated privileges on the target system.
How to mitigate CVE-2025-21191
Install updates from vendor's website.