CVE-2026-20810

HIGH
2026-01-13 [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 - 21:54 vuln.today
CVE Published
Jan 13, 2026 - 18:16 nvd
HIGH 7.8

Tags

Windows Windows Server 2019 Windows 10 21h2 Windows 10 22h2 Windows 10 1809 Microsoft

Description

Free of memory not on the heap in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Analysis

The Windows Ancillary Function Driver for WinSock contains an improper memory deallocation vulnerability (CWE-590) that allows authenticated local attackers to achieve privilege escalation on affected Windows 10 and Windows Server 2019 systems. An attacker with local user privileges can exploit this flaw to gain SYSTEM-level access without user interaction. …

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Remediation

Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.

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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-2026-20810 vulnerability details – vuln.today
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