CVE-2025-21391

Name: CVE-2025-21391
Creator: NVD / NIST
Published: 2025-02-11T18:15:37.723+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.1/10Actively ExploitedEPSS 2.14%

Last modified Jun 17, 2026

CVE-2025-21391 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. Windows Storage Elevation of Privilege Vulnerability. CISA has confirmed active exploitation in the wild. EPSS estimates a 2.14% chance of exploitation in the next 30 days.

Description

Windows Storage Elevation of Privilege Vulnerability

Metrics

CVSS 3.1

7.1/10

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

EPSS Probability

2.14%

79.8th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Mar 4, 2025.

Weakness Enumeration

CWE-59

Affected Software

Vendor	Product	Versions
Microsoft	Windows 10 1507	< 10.0.10240.20915
Microsoft	Windows 10 1607	< 10.0.14393.7785
Microsoft	Windows 10 1809	< 10.0.17763.6893
Microsoft	Windows 10 21h2	< 10.0.19044.5487
Microsoft	Windows 10 22h2	< 10.0.19045.5487
Microsoft	Windows 11 22h2	< 10.0.22621.4890
Microsoft	Windows 11 23h2	< 10.0.22631.4890
Microsoft	Windows 11 24h2	< 10.0.26100.3107
Microsoft	Windows Server 2016	< 10.0.14393.7785
Microsoft	Windows Server 2019	< 10.0.17763.6893
Microsoft	Windows Server 2022	< 10.0.20348.3148
Microsoft	Windows Server 2022 23h2	< 10.0.25398.1425
Microsoft	Windows Server 2025	< 10.0.26100.3107

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21391Patch, Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-21391US Government Resource

Timeline

Published: Feb 11, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-21391?

Windows Storage Elevation of Privilege Vulnerability

How severe is CVE-2025-21391?

CVE-2025-21391 has a CVSS score of 7.1/10 (HIGH severity). The EPSS model estimates a 2.14% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2025-21391?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-21391?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST