High · 8.1 CVE-2026-62820 EUVD-2026-56397GHSA-7pwv-3vv8-2r9v

Windows DNS Server Remote Code Execution Vulnerability

Published Aug 11, 2026 · Updated Nov 10, 2026 · Assigned by microsoft

Vendor: Microsoft Product: Windows Server 2016 Product: Windows Server 2016 (Server Core installation) Product: Windows Server 2019 Product: Windows Server 2019 (Server Core installation) Product: Windows Server 2022 Product: Windows Server 2025 Product: Windows Server 2025 (Server Core installation) Platform: Windows

Description

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

Affected products

Vendor	Product	Affected	Fixed
Microsoft	Windows Server 2016	10.0.14393.0 – < 10.0.14393.9418	10.0.14393.9418
Microsoft	Windows Server 2016 (Server Core installation)	10.0.14393.0 – < 10.0.14393.9418	10.0.14393.9418
Microsoft	Windows Server 2019	10.0.17763.0 – < 10.0.17763.9121	10.0.17763.9121
Microsoft	Windows Server 2019 (Server Core installation)	10.0.17763.0 – < 10.0.17763.9121	10.0.17763.9121
Microsoft	Windows Server 2022	10.0.20348.0 – < 10.0.20348.5499	10.0.20348.5499
Microsoft	Windows Server 2025	10.0.26100.0 – < 10.0.26100.33296	10.0.26100.33296
Microsoft	Windows Server 2025 (Server Core installation)	10.0.26100.0 – < 10.0.26100.33296	10.0.26100.33296

Advisories 3

WID-SEC-2026-2756 Microsoft Windows Produkte: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 30, 2026
MSRC-CVE-2026-62820 Windows DNS Server Remote Code Execution Vulnerability Microsoft Security Response Center · Sep 8, 2026
NCSC-2026-0284 Kwetsbaarheden verholpen in Microsoft Windows NCSC-NL (Netherlands) · Aug 11, 2026

References

Windows DNS Server Remote Code Execution Vulnerability vendor-advisory patch