CVE-2025-21391

HIGH7.1

CISA KEV

Published 2025-02-11 · Updated 2026-09-24 · Source secure@microsoft.com

Summary

CVE-2025-21391 is a high-severity (CVSS 7.1) vulnerability in Microsoft Windows. CISA added it to the Known Exploited Vulnerabilities catalog on February 11, 2025, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by March 4, 2025. CISA does not currently list it as used in ransomware campaigns. Microsoft has 390 vulnerabilities in the KEV catalog, 117 of them linked to ransomware.

All 390 known-exploited Microsoft vulnerabilities →

Description

Windows Storage Elevation of Privilege Vulnerability

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

CWE-59

CISA Known-Exploited Vulnerability

Product: Microsoft — Windows

Name: Microsoft Windows Storage Link Following Vulnerability

Date added: 2025-02-11 · Due: 2025-03-04

Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

References

View on NVD

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