CVE-2023-21687: Microsoft Windows 11 21h2

Medium severity, CVSS 5.5. EPSS: 0.5% chance of exploitation in the next 30 days.

HTTP.sys Information Disclosure Vulnerability

Affected products

• Microsoft Windows 11 21h2: before 10.0.22000.1574 (fixed in 10.0.22000.1574)
• Microsoft Windows 11 22h2: before 10.0.22621.1265 (fixed in 10.0.22621.1265)
• Microsoft Windows Server 2022: affected versions not specified

Published 2023-02-14. Last modified 2026-08-19.