CVE-2025-27479: Microsoft Windows Server 2012

High severity, CVSS 7.5. EPSS: 2.2% chance of exploitation in the next 30 days.

Insufficient resource pool in Windows Kerberos allows an unauthorized attacker to deny service over a network.

Affected products

• Microsoft Windows Server 2012: affected versions not specified; version r2 only
• Microsoft Windows Server 2016: before 10.0.14393.7969 (fixed in 10.0.14393.7969)
• Microsoft Windows Server 2019: before 10.0.17763.7136 (fixed in 10.0.17763.7136)
• Microsoft Windows Server 2022: before 10.0.20348.3453 (fixed in 10.0.20348.3453)
• Microsoft Windows Server 2022 23h2: before 10.0.25398.1551 (fixed in 10.0.25398.1551)
• Microsoft Windows Server 2025: before 10.0.26100.3775 (fixed in 10.0.26100.3775)

Published 2025-04-08. Last modified 2026-06-17.