CVE-2026-83647: Microsoft Windows 10 Version 1607

High severity, CVSS 7.5. EPSS: 1.1% chance of exploitation in the next 30 days.

Out-of-bounds read in Active Directory Domain Services allows an unauthorized attacker to deny service over a network.

Affected products

• Microsoft Windows 10 Version 1607: from 10.0.14393.0, before 10.0.14393.9612 (fixed in 10.0.14393.9612)
• Microsoft Windows 10 Version 1809: from 10.0.17763.0, before 10.0.17763.9376 (fixed in 10.0.17763.9376)
• Microsoft Windows 10 Version 21h2: from 10.0.19044.0, before 10.0.19044.7807 (fixed in 10.0.19044.7807)
• Microsoft Windows 10 Version 22h2: from 10.0.19045.0, before 10.0.19045.7807 (fixed in 10.0.19045.7807)
• Microsoft Windows 11 Version 23h2: from 10.0.22631.0, before 10.0.22631.7652 (fixed in 10.0.22631.7652)
• Microsoft Windows 11 Version 24h2: from 10.0.26100.0, before 10.0.26100.9711 (fixed in 10.0.26100.9711)
• Microsoft Windows 11 Version 25h2: from 10.0.26200.0, before 10.0.26200.9711 (fixed in 10.0.26200.9711)
• Microsoft Windows 11 Version 26h1: from 10.0.28000.0, before 10.0.28000.3231 (fixed in 10.0.28000.3231)
• Microsoft Windows 11 Version 26h2: from 10.0.26300.0, before 10.0.26300.9711 (fixed in 10.0.26300.9711)
• Microsoft Windows Server 2012 r2: from 6.3.9600.0, before 6.3.9600.23470 (fixed in 6.3.9600.23470)
• Microsoft Windows Server 2012 r2 Server Core Installation: from 6.3.9600.0, before 6.3.9600.23470 (fixed in 6.3.9600.23470)
• Microsoft Windows Server 2016: from 10.0.14393.0, before 10.0.14393.9612 (fixed in 10.0.14393.9612)
• Microsoft Windows Server 2016 Server Core Installation: from 10.0.14393.0, before 10.0.14393.9612 (fixed in 10.0.14393.9612)
• Microsoft Windows Server 2019: from 10.0.17763.0, before 10.0.17763.9376 (fixed in 10.0.17763.9376)
• Microsoft Windows Server 2019 Server Core Installation: from 10.0.17763.0, before 10.0.17763.9376 (fixed in 10.0.17763.9376)
• Microsoft Windows Server 2022: from 10.0.20348.0, before 10.0.20348.5761 (fixed in 10.0.20348.5761)
• Microsoft Windows Server 2025: from 10.0.26100.0, before 10.0.26100.33650 (fixed in 10.0.26100.33650)
• Microsoft Windows Server 2025 Server Core Installation: from 10.0.26100.0, before 10.0.26100.33650 (fixed in 10.0.26100.33650)

Published 2026-10-13. Last modified 2026-10-16.