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CVE-2026-20934

nvd nist
Published: Jan 13, 2026Modified: Jan 16, 2026

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7.5
Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploitability: 1.6 / Impact: 5.9
Source: secure@microsoft.com

Description

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.

Affected (23)

Microsoft
13 products
Windows 10 1607
Windows 10 1809
Windows 10 21h2
Windows 10 22h2
Windows 11 23h2
Windows 11 24h2
Windows 11 25h2
Windows Server 2012
Windows Server 2016
Windows Server 2019
Windows Server 2022
Windows Server 2022 23h2
Windows Server 2025
Configuration A
23 vulnerable
Vulnerable SoftwareAffected Versions
Microsoft
Windows 10 1607
Before 10.0.14393.8783
Windows 10 1607
Before 10.0.14393.8783
Microsoft
Windows 10 1809
Before 10.0.17763.8276
Windows 10 1809
Before 10.0.17763.8276
Microsoft
Windows 10 21h2
Before 10.0.19044.6809
Windows 10 21h2
Before 10.0.19044.6809
Windows 10 21h2
Before 10.0.19044.6809
Microsoft
Windows 10 22h2
Before 10.0.19045.6809
Windows 10 22h2
Before 10.0.19045.6809
Windows 10 22h2
Before 10.0.19045.6809
Microsoft
Windows 11 23h2
Before 10.0.22631.6491
Windows 11 23h2
Before 10.0.22631.6491
Microsoft
Windows 11 24h2
Before 10.0.26100.7623
Windows 11 24h2
Before 10.0.26100.7623
Microsoft
Windows 11 25h2
Before 10.0.26200.7623
Windows 11 25h2
Before 10.0.26200.7623
Microsoft
Windows Server 2012
All versions
Windows Server 2012
Version r2
Windows Server 2016
Before 10.0.14393.8783
Windows Server 2019
Before 10.0.17763.8276
Windows Server 2022
Before 10.0.20348.4648
Windows Server 2022 23h2
Before 10.0.25398.2092
Windows Server 2025
Before 10.0.26100.32230

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)

Source: secure@microsoft.com
Vendor Advisory

Timeline

No history available yet.