CVE-2025-21271: Microsoft Windows 10 1809

High severity, CVSS 7.8. EPSS: 0.5% chance of exploitation in the next 30 days.

Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability

Affected products

• Microsoft Windows 10 1809: before 10.0.17763.6775 (fixed in 10.0.17763.6775)
• Microsoft Windows 10 21h2: before 10.0.19044.5371 (fixed in 10.0.19044.5371)
• Microsoft Windows 10 22h2: before 10.0.19045.5371 (fixed in 10.0.19045.5371)
• Microsoft Windows Server 2019: before 10.0.17763.6775 (fixed in 10.0.17763.6775)
• Microsoft Windows Server 2022: before 10.0.20348.3091 (fixed in 10.0.20348.3091)

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