CVE-2025-49666: Microsoft Windows Server 2016

High severity, CVSS 7.2. EPSS: 1.4% chance of exploitation in the next 30 days.

Heap-based buffer overflow in Windows Kernel allows an authorized attacker to execute code over a network.

Affected products

• Microsoft Windows Server 2016: before 10.0.14393.8246 (fixed in 10.0.14393.8246)
• Microsoft Windows Server 2019: before 10.0.17763.7558 (fixed in 10.0.17763.7558)
• Microsoft Windows Server 2022: before 10.0.20348.3932 (fixed in 10.0.20348.3932)
• Microsoft Windows Server 2022 23h2: before 10.0.25398.1732 (fixed in 10.0.25398.1732)
• Microsoft Windows Server 2025: before 10.0.26100.4652 (fixed in 10.0.26100.4652)

Published 2025-07-08. Last modified 2026-06-17.