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CVE-2025-21311

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

Windows NTLM V1 Elevation of Privilege Vulnerability

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

Affected software

Vendor	Product	Versions
Microsoft	Windows 11 Version 24H2	>= 10.0.26100.0, < 10.0.26100.2894
Microsoft	Windows Server 2022, 23H2 Edition (Server Core installation)	>= 10.0.25398.0, < 10.0.25398.1369
Microsoft	Windows Server 2025	>= 10.0.26100.0, < 10.0.26100.2894
Microsoft	Windows Server 2025 (Server Core installation)	>= 10.0.26100.0, < 10.0.26100.2894

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21311Patch, Vendor Advisory

Timeline

Published: Jan 14, 2025
Last modified: Jun 17, 2026
NVD status: Analyzed

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CVE-2025-21311: Critical severity, CVSS 9.8 | Vulnix