CVE-2026-21251

  1. Yack CVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-21251

7.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

U

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

References
Link Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21251 Vendor Advisory
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
History

11 Feb 2026, 19:42

Type Values Removed Values Added
CPE cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
First Time Microsoft windows Server 2025
Microsoft windows Server 2019
Microsoft windows Server 2022
Microsoft windows Server 2022 23h2
Microsoft windows Server 2016
Microsoft
References () https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21251 - () https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21251 - Vendor Advisory

10 Feb 2026, 18:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-02-10 18:16

Updated : 2026-02-11 19:42

NVD link : CVE-2026-21251

Mitre link : CVE-2026-21251

CVE.ORG link : CVE-2026-21251

JSON object : View

Products Affected

microsoft

CWE
CWE-416

Use After Free