CVE-2025-21343: Microsoft Windows 11 22h2

High severity, CVSS 7.5. EPSS: 1.3% chance of exploitation in the next 30 days.

Windows Web Threat Defense User Service Information Disclosure Vulnerability

Affected products

• Microsoft Windows 11 22h2: before 10.0.22621.4751 (fixed in 10.0.22621.4751)
• Microsoft Windows 11 23h2: before 10.0.22631.4751 (fixed in 10.0.22631.4751)
• Microsoft Windows 11 24h2: before 10.0.26100.2894 (fixed in 10.0.26100.2894)

Published 2025-01-14. Last modified 2026-06-17.