CVE-2026-21236

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

Description

Heap-based buffer overflow in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Analysis

Windows Ancillary Function Driver for WinSock contains a heap buffer overflow vulnerability that enables authenticated local users to achieve privilege escalation on affected Windows 10 and Server 2012 systems. An attacker with valid user credentials can exploit this memory corruption flaw to execute arbitrary code with elevated privileges. …

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Remediation

Within 24 hours: Inventory all Windows systems running affected WinSock versions and assess which have untrusted local users or service accounts. Within 7 days: Implement application whitelisting to restrict WinSock driver modifications, review and restrict local user privileges, and disable unnecessary WinSock functionality 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-2026-21236 vulnerability details – vuln.today
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