CVE-2026-62820

Published: Aug 11, 2026Modified: Sep 2, 2026

8.1

Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitability: 2.2 / Impact: 5.9

Source: secure@microsoft.com (Secondary)

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 (8)

Products: Microsoft: Windows 10 1607, Windows 10 1809, Windows Server 2016, Windows Server 2019, Windows Server 2022, Windows Server 2025

6 products

Configuration A

8 vulnerable

Vulnerable Software	Affected Versions
Microsoft Windows 10 1607	Before 10.0.14393.9418
Microsoft Windows 10 1607	Before 10.0.14393.9418
Microsoft Windows 10 1809	Before 10.0.17763.9121
Microsoft Windows 10 1809	Before 10.0.17763.9121
Microsoft Windows Server 2016	Before 10.0.14393.9418
Microsoft Windows Server 2019	Before 10.0.17763.9121
Microsoft Windows Server 2022	Before 10.0.20348.5440
Microsoft Windows Server 2025	Before 10.0.26100.33222

Related CWEs

CWE-362

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently.

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62820

Source: secure@microsoft.com

PatchVendor Advisory

Timeline

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