CVE-2026-27921

| EUVD-2026-22467 HIGH
2026-04-14 microsoft GHSA-wjm4-8wvf-p2wh
Information Disclosure Race Condition 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 11 Version 26H1 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 Windows Server 2025 Windows Server 2025 Server Core Installation
7.0
CVSS 3.1
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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 - 19:16 vuln.today

DescriptionNVD

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows TCP/IP allows an authorized attacker to elevate privileges locally.

AnalysisAI

Local privilege escalation in Windows TCP/IP stack across Windows 10, 11, and Server editions allows low-privileged authenticated users to gain SYSTEM-level access by exploiting a race condition in shared resource synchronization. This CWE-362 flaw affects every supported Windows version from legacy Server 2012 through cutting-edge Windows 11 26H1, with vendor-released patches available. …

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RemediationAI

Within 24 hours: Inventory all Windows 10, 11, and Server 2012-2022 systems and verify current patch levels using WSUS or endpoint management tools. Within 7 days: Deploy the vendor-released patch to non-production test environments and validate application compatibility. …

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CVE-2026-27921 vulnerability details – vuln.today
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