EUVD-2026-22621

| CVE-2026-33099 HIGH
2026-04-14 microsoft GHSA-mvpf-27qc-fjcx
Denial Of Service Use After Free Memory Corruption Microsoft Windows 10 Version 1607 Windows 10 Version 1809 Windows 10 Version 21H2 Windows 10 Version 22H2 Windows 11 Version 22H3 Windows 11 Version 23H2 Windows 11 Version 24H2 Windows 11 Version 25H2 Windows Server 2012 Windows Server 2012 Server Core Installation Windows Server 2012 R2 Windows Server 2012 R2 Server Core Installation Windows Server 2016 Windows Server 2016 Server Core Installation Windows Server 2019 Windows Server 2019 Server Core Installation Windows Server 2022 Windows Server 2022 23H2 Edition Server Core Installation
7.0
CVSS 3.1
Temporal: 6.1
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CVSS VectorNVD

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

1
Analysis Generated
Apr 14, 2026 - 19:36 vuln.today

DescriptionNVD

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

AnalysisAI

Local privilege escalation via use-after-free in Windows Ancillary Function Driver for WinSock (AFD.sys) allows authenticated low-privileged attackers to execute arbitrary code with SYSTEM privileges across all supported Windows versions. Microsoft has released patches for Windows 10 (versions 1607-22H2), Windows 11 (versions 22H3-25H2), and Windows Server (2012-2022 23H2). …

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RemediationAI

Within 24 hours: Inventory all Windows 10 (versions 1607-22H2), Windows 11 (versions 22H3-25H2), and Windows Server 2012-2022 23H2 systems in your environment. Within 7 days: Apply Microsoft-released patches to all identified systems; prioritize domain controllers, servers running critical services, and administrative workstations. …

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EUVD-2026-22621 vulnerability details – vuln.today
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