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CVE-2026-21238

nvd nist
Published: Feb 10, 2026Modified: Feb 11, 2026

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7.8
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploitability: 1.8 / Impact: 5.9
Source: secure@microsoft.com

Description

Improper access control in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

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 10.0.14393.8868
Windows 10 1607
Before 10.0.14393.8868
Microsoft
Windows 10 1809
Before 10.0.17763.8389
Windows 10 1809
Before 10.0.17763.8389
Microsoft
Windows 10 21h2
Before 10.0.19044.6937
Windows 10 21h2
Before 10.0.19044.6937
Windows 10 21h2
Before 10.0.19044.6937
Microsoft
Windows 10 22h2
Before 10.0.19045.6937
Windows 10 22h2
Before 10.0.19045.6937
Windows 10 22h2
Before 10.0.19045.6937
Microsoft
Windows 11 23h2
Before 10.0.22631.6649
Windows 11 23h2
Before 10.0.22631.6649
Microsoft
Windows 11 24h2
Before 10.0.26100.7781
Windows 11 24h2
Before 10.0.26100.7781
Microsoft
Windows 11 25h2
Before 10.0.26200.7781
Windows 11 25h2
Before 10.0.26200.7781
Microsoft
Windows Server 2012
All versions
Windows Server 2012
Version r2
Windows Server 2016
Before 10.0.14393.8868
Windows Server 2019
Before 10.0.17763.8389
Windows Server 2022
Before 10.0.20348.4711
Windows Server 2022 23h2
Before 10.0.25398.2149
Windows Server 2025
Before 10.0.26100.32313

Related CWEs

CWE-284
Improper Access Control
The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

References (1)

Source: secure@microsoft.com
Vendor Advisory

Timeline

No history available yet.