CVE-2025-21391: Microsoft Windows Storage Link Following Vulnerability

High severity, CVSS 7.1. Actively exploited: in CISA KEV since 2025-02-11. EPSS: 2.3% chance of exploitation in the next 30 days.

Windows Storage Elevation of Privilege Vulnerability

Affected products

• Microsoft Windows 10 1507: before 10.0.10240.20915 (fixed in 10.0.10240.20915)
• Microsoft Windows 10 1607: before 10.0.14393.7785 (fixed in 10.0.14393.7785)
• Microsoft Windows 10 1809: before 10.0.17763.6893 (fixed in 10.0.17763.6893)
• Microsoft Windows 10 21h2: before 10.0.19044.5487 (fixed in 10.0.19044.5487)
• Microsoft Windows 10 22h2: before 10.0.19045.5487 (fixed in 10.0.19045.5487)
• Microsoft Windows 11 22h2: before 10.0.22621.4890 (fixed in 10.0.22621.4890)
• Microsoft Windows 11 23h2: before 10.0.22631.4890 (fixed in 10.0.22631.4890)
• Microsoft Windows 11 24h2: before 10.0.26100.3107 (fixed in 10.0.26100.3107)
• Microsoft Windows Server 2016: before 10.0.14393.7785 (fixed in 10.0.14393.7785)
• Microsoft Windows Server 2019: before 10.0.17763.6893 (fixed in 10.0.17763.6893)
• Microsoft Windows Server 2022: before 10.0.20348.3148 (fixed in 10.0.20348.3148)
• Microsoft Windows Server 2022 23h2: before 10.0.25398.1425 (fixed in 10.0.25398.1425)
• Microsoft Windows Server 2025: before 10.0.26100.3107 (fixed in 10.0.26100.3107)

Published 2025-02-11. Last modified 2026-09-24.