CVE-2025-21311 json
Windows NTLM V1 Elevation of Privilege Vulnerability
published 2025-01-14 21 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-2376
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.3%
- EPSS 2.3% chance of exploitation in 30 days, percentile 83%
- public exploits
- 0
- none known
Summary
Windows NTLM V1 Elevation of Privilege Vulnerability
Patch / fix
- Microsoft Windows 11 Version 24H2 10.0.26100.2894
- Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1369
- Microsoft Windows Server 2025 10.0.26100.2894
- Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.2894
- squid Debian 14 7.1-1
debian advisories DEBIAN-CVE-2025-21311
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 21 mo ago
Exploit prediction
2.26% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.8 | 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 |
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
- Microsoft Windows 11 Version 24H2
- Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)
- Microsoft Windows Server 2025
- Microsoft Windows Server 2025 (Server Core installation)
Classification
- Weakness
-
- CWE-303 Incorrect Implementation of Authentication Algorithm
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2025-21311
vendor-advisory, patch
Sources
- CVE List CVE-2025-21311
- NVD CVE-2025-21311
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.