CVE-2026-21241

HIGH
2026-02-10 [email protected]
7.0
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
High
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 7.0

Tags

Windows Use After Free Windows Server 2022 23h2 Windows 11 23h2 Windows Server 2022 Windows Server 2025 Windows 11 24h2 Windows 11 25h2 Microsoft

Description

Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Analysis

Windows Ancillary Function Driver for WinSock in Windows 11 23h2 and Windows Server 2022 23h2 contains a use-after-free vulnerability that allows authenticated local users to achieve privilege escalation. An attacker with local access and valid credentials can trigger the memory safety flaw to gain elevated system privileges. …

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Remediation

Within 24 hours: Inventory all Windows systems and identify those with the vulnerable WinSock driver; disable non-essential WinSock Auxiliary Function Driver services where operationally feasible. Within 7 days: Implement network segmentation to restrict local access for non-administrative users; audit and enforce principle of least privilege for all user accounts. …

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Priority Score

35
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +35
POC: 0

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CVE-2026-21241 vulnerability details – vuln.today
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