CVE-2025-55339: Microsoft Windows 11 22h2

High severity, CVSS 7.8. EPSS: 0.4% chance of exploitation in the next 30 days.

Out-of-bounds read in Windows NDIS allows an authorized attacker to elevate privileges locally.

Affected products

• Microsoft Windows 11 22h2: before 10.0.22621.6060 (fixed in 10.0.22621.6060)
• Microsoft Windows 11 23h2: before 10.0.22631.6060 (fixed in 10.0.22631.6060)
• Microsoft Windows 11 24h2: before 10.0.26100.6899 (fixed in 10.0.26100.6899)
• Microsoft Windows 11 25h2: before 10.0.26200.6899 (fixed in 10.0.26200.6899)
• Microsoft Windows Server 2022: before 10.0.20348.4294 (fixed in 10.0.20348.4294)
• Microsoft Windows Server 2022 23h2: before 10.0.25398.1913 (fixed in 10.0.25398.1913)
• Microsoft Windows Server 2025: before 10.0.26100.6899 (fixed in 10.0.26100.6899)

Published 2025-10-14. Last modified 2026-06-17.