CVE-2025-55231: Microsoft Windows Server 2012

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Storage allows an unauthorized attacker to execute code over a network.

Affected products

• Microsoft Windows Server 2012: version r2 only
• Microsoft Windows Server 2016: before 10.0.14393.8416 (fixed in 10.0.14393.8416)
• Microsoft Windows Server 2019: before 10.0.17763.7783 (fixed in 10.0.17763.7783)
• Microsoft Windows Server 2022: before 10.0.20348.4161 (fixed in 10.0.20348.4161)
• Microsoft Windows Server 2025: before 10.0.26100.6563 (fixed in 10.0.26100.6563)

Published 2025-08-21. Last modified 2026-06-17.