CVE-2025-55683

Windows Kernel Information Disclosure Vulnerability

CVE-2025-55683 is fixed in 9 products on 1 platform, first by KB5066836, released October 14, 2025. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

5.5

Important

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0056

46th percentile

<p>Exposure of sensitive information to an unauthorized actor in Windows Kernel allows an authorized attacker to disclose information locally.</p>

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
Windows Server 2016	14393.8519	KB5066836	Oct 14, 2025
Windows Server 2016 (Server Core installation)	14393.8519	KB5066836	Oct 14, 2025
Windows Server 2019	17763.7919	KB5066586	Oct 14, 2025
Windows Server 2019 (Server Core installation)	17763.7919	KB5066586	Oct 14, 2025
Windows Server 2022	20348.4294	KB5066782	Oct 14, 2025
Windows Server 2022 (Server Core installation)	20348.4294	KB5066782	Oct 14, 2025
Windows Server 2022, 23H2 Edition (Server Core installation)	25398.1913	KB5066780	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
Exposure of Sensitive Information to an Unauthorized Actor
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55683

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