CVE-2025-55693

Windows Kernel Elevation of Privilege Vulnerability

CVE-2025-55693 is fixed in 6 products on 1 platform, first by KB5066835, released October 14, 2025. It is not reported as exploited, but the vendor rates exploitation more likely. Patch Radar priority: Urgent.

Urgent

CVSS

7.4

Important

Exploitation

More likely

Vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0211

81st percentile

<p>Use after free in Windows Kernel allows an unauthorized attacker to elevate privileges locally.</p>

Where it's fixed

Product	Fix	Released
Microsoft
Windows 11 Version 24H2 for ARM64-based Systems	KB5066835	Oct 14, 2025
Windows 11 Version 24H2 for x64-based Systems	KB5066835	Oct 14, 2025
Windows 11 Version 25H2 for ARM64-based Systems	KB5066835	Oct 14, 2025
Windows 11 Version 25H2 for x64-based Systems	KB5066835	Oct 14, 2025
Windows Server 2025	KB5066835	Oct 14, 2025
Windows Server 2025 (Server Core installation)	KB5066835	Oct 14, 2025

Details

Published
October 14, 2025
Weakness
Use After Free
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55693

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