CVE-2025-21325: Windows Secure Kernel Mode Elevation of Privilege Vulnerability

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-01-17 · updated 2026-06-17
Weakness: CWE-732

Description

Windows Secure Kernel Mode Elevation of Privilege Vulnerability

Affected products

Microsoft Windows 10: before 10.0.19044.5371 — fixed in 10.0.19044.5371
Microsoft Windows 10: before 10.0.19045.5371 — fixed in 10.0.19045.5371
Microsoft Windows 11: before 10.0.22621.4751 — fixed in 10.0.22621.4751
Microsoft Windows 11: before 10.0.22631.4751 — fixed in 10.0.22631.4751
Microsoft Windows 11: before 10.0.26100.2894 — fixed in 10.0.26100.2894
Microsoft Windows Server 2025: before 10.0.26100.2894 — fixed in 10.0.26100.2894
Microsoft Windows 10: from 10.0.19044.0 before 10.0.19044.5371 — fixed in 10.0.19044.5371
Microsoft Windows 10: from 10.0.19045.0 before 10.0.19045.5371 — fixed in 10.0.19045.5371
Microsoft Windows 11: from 10.0.22621.0 before 10.0.22621.4751 — fixed in 10.0.22621.4751
Microsoft Windows 11 version 22H3: from 10.0.22631.0 before 10.0.22631.4751 — fixed in 10.0.22631.4751
Microsoft Windows 11: from 10.0.22631.0 before 10.0.22631.4751 — fixed in 10.0.22631.4751
Microsoft Windows 11: from 10.0.26100.0 before 10.0.26100.2894 — fixed in 10.0.26100.2894
Microsoft Windows Server 2025: from 10.0.26100.0 before 10.0.26100.2894 — fixed in 10.0.26100.2894

How to fix

Upgrade to a fixed version: Microsoft Windows 10 10.0.19044.5371; Microsoft Windows 10 10.0.19045.5371; Microsoft Windows 11 10.0.22621.4751; Microsoft Windows 11 10.0.22631.4751; Microsoft Windows 11 10.0.26100.2894; Microsoft Windows Server 2025 10.0.26100.2894; Microsoft Windows 10 10.0.19044.5371; Microsoft Windows 10 10.0.19045.5371; Microsoft Windows 11 10.0.22621.4751; Microsoft Windows 11 version 22H3 10.0.22631.4751; Microsoft Windows 11 10.0.22631.4751; Microsoft Windows 11 10.0.26100.2894. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21325

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