CVE-2026-21251

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 Use After Free Windows Server 2019 Windows Server 2025 Windows Server 2016 Windows Server 2022 Windows Server 2022 23h2 Microsoft

Description

Use after free in Windows Cluster Client Failover allows an authorized attacker to elevate privileges locally.

Analysis

Privilege escalation in Windows Cluster Client Failover exploits a use-after-free memory vulnerability, enabling authenticated local users to gain elevated system privileges. The flaw affects Windows Server 2016, 2019, and 2025 installations where an attacker with existing local access can trigger the vulnerability through the failover clustering component. …

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Remediation

Within 24 hours: Inventory all systems running Windows Cluster Client Failover and assess exposure; restrict cluster administrative access to essential personnel only. Within 7 days: Implement enhanced monitoring for unusual privilege escalation attempts and review cluster access logs for suspicious activity. …

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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-2026-21251 vulnerability details – vuln.today
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