PT-2026-7355 · Microsoft · Windows

Chenjian · Published 2026-02-10 · Updated 2026-02-10 · CVE-2026-21251

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Windows (affected versions not specified)

Description A flaw exists in Windows Cluster Client Failover that could allow an authorized attacker to gain higher-level permissions on a system. This issue involves a use-after-free condition. An attacker could exploit this to elevate privileges locally.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

BDU:2026-01806

CVE-2026-21251

Affected Products

Windows

References · 6

• https://bdu.fstec.ru/vul/2026-01806 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21251 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-21251 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21251 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-21251 · Security Note
• https://osv.dev/vulnerability/CVE-2026-21251 · Vendor Advisory