CVE tracker / CVE-2025-21367

CVE-2025-21367

CVE-2025-21367 is the Windows Win32 Kernel Subsystem Elevation of Privilege Vulnerability. Microsoft rates it Important, CVSS 7.8. It is not in CISA's Known Exploited Vulnerabilities catalog. Published February 11, 2025.

Risk summary

HighElevation of Privilege

7.8

CVSS v3 base

0.6%

EPSS: chance of exploitation in 30 days

High

Severity

Important

Microsoft's rating

More Likely

Microsoft: exploitation

In CISA KEV

How to fix it

Microsoft lists 21 affected products and the update that fixes each:

KB5051974 · fixed build 10.0.19045.5487, 10.0.19044.5487
Windows 10 Version 22H2 for 32-bit Systems, Windows 10 Version 22H2 for ARM64-based Systems, Windows 10 Version 22H2 for x64-based Systems, Windows 10 Version 21H2 for x64-based Systems, Windows 10 Version 21H2 for ARM64-based Systems, and 1 more
KB5051979 · fixed build 10.0.20348.3207
Windows Server 2022 (Server Core installation), Windows Server 2022
KB5051980 · fixed build 10.0.25398.1425
Windows Server 2022, 23H2 Edition (Server Core installation)
KB5051987 · fixed build 10.0.26100.3194
Windows Server 2025, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 24H2 for ARM64-based Systems, Windows Server 2025 (Server Core installation)
KB5051989 · fixed build 10.0.22631.4890, 10.0.22621.4890
Windows 11 Version 23H2 for x64-based Systems, Windows 11 Version 23H2 for ARM64-based Systems, Windows 11 Version 22H2 for x64-based Systems, Windows 11 Version 22H2 for ARM64-based Systems
KB5052000 · fixed build 10.0.17763.6893
Windows Server 2019 (Server Core installation), Windows Server 2019, Windows 10 Version 1809 for x64-based Systems, Windows 10 Version 1809 for 32-bit Systems

What Microsoft changed

December 17, 2025: Added an acknowledgement. This is an informational change only.
February 11, 2025: Information published.

Details

Weakness: CWE-416: Use After Free
Publicly disclosed (Microsoft): No
Exploited (Microsoft): No
Known exploited (CISA KEV): Not listed
Published: February 11, 2025
Last revised: December 17, 2025

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References

Microsoft Security Update Guide NVD CVE record CWE

From Microsoft, CISA, NVD and FIRST data; the Microsoft details were read when this page was opened. Check the references above before you act.