CVE-2026-83665: Microsoft Windows 10 Version 1607

High severity, CVSS 7.5. EPSS: 1.2% chance of exploitation in the next 30 days.

Null pointer dereference in Windows DHCP Server 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 Server 2012: from 6.2.9200.0, before 6.2.9200.26434 (fixed in 6.2.9200.26434)
• 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 2012 Server Core Installation: from 6.2.9200.0, before 6.2.9200.26434 (fixed in 6.2.9200.26434)
• 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 2026-10-13.