CVE-2025-21182: Microsoft Windows 11 24h2

High severity, CVSS 7.4. EPSS: 0.5% chance of exploitation in the next 30 days.

Windows Resilient File System (ReFS) Deduplication Service Elevation of Privilege Vulnerability

Affected products

• Microsoft Windows 11 24h2: before 10.0.26100.3107 (fixed in 10.0.26100.3107)
• Microsoft Windows Server 2025: before 10.0.26100.3107 (fixed in 10.0.26100.3107)

Published 2025-02-11. Last modified 2026-06-17.