CVE-2025-21311

Windows NTLM V1 Elevation of Privilege Vulnerability

Description

Windows NTLM V1 Elevation of Privilege Vulnerability

Category

9.8
CVSS
Severity: Critical
CVSS 3.1 •
EPSS 6.58% Top 10%
Vendor Advisory microsoft.com
Affected: Microsoft Windows Server 2025 (Server Core installation)
Affected: Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)
Affected: Microsoft Windows 11 Version 24H2
Affected: Microsoft Windows Server 2025
Published at:
Updated at:

References

Link Tags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21311 patch vendor advisory

Frequently Asked Questions

What is the severity of CVE-2025-21311?
CVE-2025-21311 has been scored as a critical severity vulnerability.
How to fix CVE-2025-21311?
To fix CVE-2025-21311, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-21311 being actively exploited in the wild?
It is possible that CVE-2025-21311 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~7% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-21311?
CVE-2025-21311 affects Microsoft Windows Server 2025 (Server Core installation), Microsoft Windows Server 2022, 23H2 Edition (Server Core installation), Microsoft Windows 11 Version 24H2, Microsoft Windows Server 2025.
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