Vulnerability in Microsoft Windows 11 Version 24h2
CVE-2025-21311
Windows NTLM V1 Elevation of Privilege Vulnerability
EPSS: 0.033 (87.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C.
Affected products
- Microsoft Windows 11 Version 24h2 — versions 10.0.26100.0
- Microsoft Windows Server 2022, 23h2 Edition (Server Core Installation) — versions 10.0.25398.0
- Microsoft Windows Server 2025 — versions 10.0.26100.0
- Microsoft Windows Server 2025 (Server Core Installation) — versions 10.0.26100.0
Weakness classification (CWE)
References
- Windows NTLM V1 Elevation of Privilege Vulnerability (vendor-advisory, patch)
Frequently asked questions
- What is CVE-2025-21311?
- CVE-2025-21311 is a critical-severity vulnerability in Microsoft Windows 11 Version 24h2, classified under Incorrect Implementation of Authentication Algorithm. CVSS score: 9.8/10. Published 2025-01-14.
- How severe is CVE-2025-21311?
- Critical severity. CVSS v3 base score is 9.8 out of 10.