CVE-2026-61920: Microsoft Windows 10 1607

Medium severity, CVSS 6.6. EPSS: 0.5% chance of exploitation in the next 30 days.

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

Affected products

• Microsoft Windows 10 1607: before 10.0.14393.9418 (fixed in 10.0.14393.9418)
• Microsoft Windows 10 1809: before 10.0.17763.9121 (fixed in 10.0.17763.9121)
• Microsoft Windows 11 26h1: before 10.0.28000.2704 (fixed in 10.0.28000.2704)
• Microsoft Windows Server 2012: version r2 only
• Microsoft Windows Server 2016: before 10.0.14393.9418 (fixed in 10.0.14393.9418)
• Microsoft Windows Server 2019: before 10.0.17763.9121 (fixed in 10.0.17763.9121)
• Microsoft Windows Server 2022: before 10.0.20348.5440 (fixed in 10.0.20348.5440)
• Microsoft Windows Server 2025: before 10.0.26100.33222 (fixed in 10.0.26100.33222)

Published 2026-08-11. Last modified 2026-09-02.