CVE-2025-53139: Microsoft Windows 10 21h2

High severity, CVSS 7.1. EPSS: 0.3% chance of exploitation in the next 30 days.

Cleartext transmission of sensitive information in Windows Hello allows an unauthorized attacker to bypass a security feature locally.

Affected products

• Microsoft Windows 10 21h2: before 10.0.19044.6456 (fixed in 10.0.19044.6456)
• Microsoft Windows 10 22h2: before 10.0.19045.6456 (fixed in 10.0.19045.6456)
• Microsoft Windows 11 22h2: before 10.0.22621.6060 (fixed in 10.0.22621.6060)
• Microsoft Windows 11 23h2: up to and including 10.0.22631.6060
• Microsoft Windows 11 24h2: before 10.0.26100.6899 (fixed in 10.0.26100.6899)
• Microsoft Windows 11 25h2: before 10.0.26200.6899 (fixed in 10.0.26200.6899)
• Microsoft Windows Server 2025: up to and including 10.0.26100.6899

Published 2025-10-14. Last modified 2026-06-17.