CVE-2026-21238

HIGH
2026-02-10 [email protected]
7.8
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 22:02 vuln.today
CVE Published
Feb 10, 2026 - 18:16 nvd
HIGH 7.8

Tags

Windows Windows 11 23h2 Windows Server 2022 23h2 Windows 11 25h2 Windows Server 2019 Windows 10 1809 Windows 10 22h2 Windows Server 2016 Windows Server 2025 Windows 11 24h2 Windows Server 2022 Windows 10 1607 Windows 10 21h2 Windows Server 2012 Microsoft

Description

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

Analysis

Privilege escalation in the Windows Ancillary Function Driver for WinSock affects Windows 11 and Windows Server 2022/2019, allowing authenticated local users to gain elevated system privileges. The vulnerability stems from improper access control mechanisms and currently lacks a patch. …

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Remediation

Within 24 hours: Inventory all Windows systems running affected Ancillary Function Driver for WinSock and identify high-value targets (servers, admin workstations). Within 7 days: Implement network segmentation to limit lateral movement and restrict local administrative access; disable WinSock Ancillary Function Driver where operationally feasible. …

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Priority Score

39
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +39
POC: 0

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CVE-2026-21238 vulnerability details – vuln.today
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