How severe is CVE-2025-21391?

CVE-2025-21391 has a CVSS 3.1 base score of 7.1 (HIGH). EPSS estimates a 2.3% probability of exploitation in the next 30 days. It is listed in the CISA Known Exploited Vulnerabilities catalog.

CVE-2025-21391: Windows Storage Elevation of Privilege

CISA Known Exploited Vulnerabilities

Microsoft Windows Storage Link Following Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.

Added to KEV

2025-02-11

Remediation due

2025-03-04

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

CISA notes
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21391 ; https://nvd.nist.gov/vuln/detail/CVE-2025-21391

Description

Windows Storage Elevation of Privilege Vulnerability

Severity

CVSS 3.1 · CNA7.1 HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H/E:F/RL:O/RC:C

SSVC · CISA-ADP

Exploitationactive

Automatableno

Technical impactpartial

Affected Products

Vendor	Product	Affected versions
Microsoft	Windows 10 Version 1507	10.0.10240.0 to <10.0.10240.20915
Microsoft	Windows 10 Version 1607	10.0.14393.0 to <10.0.14393.7785
Microsoft	Windows 10 Version 1809	10.0.17763.0 to <10.0.17763.6893
Microsoft	Windows 10 Version 21H2	10.0.19044.0 to <10.0.19044.5487
Microsoft	Windows 10 Version 22H2	10.0.19045.0 to <10.0.19045.5487
Microsoft	Windows 11 version 22H2	10.0.22621.0 to <10.0.22621.4890
Microsoft	Windows 11 version 22H3	10.0.22631.0 to <10.0.22631.4890
Microsoft	Windows 11 Version 23H2	10.0.22631.0 to <10.0.22631.4890
Microsoft	Windows 11 Version 24H2	10.0.26100.0 to <10.0.26100.3194
Microsoft	Windows Server 2016	10.0.14393.0 to <10.0.14393.7785
Microsoft	Windows Server 2016 (Server Core installation)	10.0.14393.0 to <10.0.14393.7785
Microsoft	Windows Server 2019	10.0.17763.0 to <10.0.17763.6893
Microsoft	Windows Server 2019 (Server Core installation)	10.0.17763.0 to <10.0.17763.6893
Microsoft	Windows Server 2022	10.0.20348.0 to <10.0.20348.3207
Microsoft	Windows Server 2022, 23H2 Edition (Server Core installation)	10.0.25398.0 to <10.0.25398.1425
Microsoft	Windows Server 2025	10.0.26100.0 to <10.0.26100.3194
Microsoft	Windows Server 2025 (Server Core installation)	10.0.26100.0 to <10.0.26100.3194

References

1 Links

Vendor advisories

Windows Storage Elevation of Privilege Vulnerability

Record Details

Published

2025-02-11

Last updated

2026-02-26

Assigner (CNA)

microsoft

Credited to

More from Microsoft

CVE-2019-07089.8

Microsoft Remote Desktop Services Remote Code Execution Vulnerability

CVE-2021-344739.1

Microsoft Exchange Server Remote Code Execution Vulnerability

CVE-2025-537709.8

Microsoft SharePoint Server Remote Code Execution Vulnerability

CVE-2021-268559.1

Microsoft Exchange Server Remote Code Execution Vulnerability

Related Tool Categories

Tool categories that test for or protect against this vulnerability class.

CWE-59 · Link Following

Application Security Tools

CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.