CVE-2026-70091

Published: Sep 8, 2026Modified: Sep 16, 2026

5.9

Vector

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

Exploitability: 2.2 / Impact: 3.6

Source: secure@microsoft.com (Secondary)

Description

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

Affected (10)

Products: Microsoft: Windows 10 1607, Windows 10 1809, Windows Server 2012, Windows Server 2016, Windows Server 2019, Windows Server 2022, Windows Server 2025

7 products

Configuration A

10 vulnerable

Vulnerable Software	Affected Versions
Microsoft Windows 10 1607	Before 10.0.14393.9512
Microsoft Windows 10 1607	Before 10.0.14393.9512
Microsoft Windows 10 1809	Before 10.0.17763.9245
Microsoft Windows 10 1809	Before 10.0.17763.9245
Microsoft Windows Server 2012	All versions
Microsoft Windows Server 2012	Version r2
Microsoft Windows Server 2016	Before 10.0.14393.9512
Microsoft Windows Server 2019	Before 10.0.17763.9245
Microsoft Windows Server 2022	Before 10.0.20348.5622
Microsoft Windows Server 2025	Before 10.0.26100.33438

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-2026-70091

Source: secure@microsoft.com

Vendor AdvisoryPatch

Timeline

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