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Vulnerability Intelligence

CVE-2025-21391

HighExploitedPublic exploit

Windows Storage Elevation of Privilege Vulnerability

Published Feb 11, 2025 · Updated Sep 24, 2026

Key Facts

Patch immediately
  • CVE-2025-21391 is a high-severity vulnerability (CVSS 7.1 v3.1) affecting Windows 10 1507 (Microsoft), Windows 10 1607 (Microsoft), Windows 10 1809 (Microsoft) and 22 more products.
  • It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Feb 11, 2025. Public exploit code is available.
  • EPSS estimates a 2.3% probability of exploitation in the next 30 days.
  • Fixed versions are available, including Windows 10 1507 10.0.10240.20915, Windows 10 1607 10.0.14393.7785, Windows 10 1809 10.0.17763.6893.
  • Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

7.1

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

EPSS (30-day exploit likelihood)

2.3%

Higher than 83.0% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2025-21391 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

Windows Storage Elevation of Privilege Vulnerability

Known-Exploited Catalog Listings

CatalogAddedRemediation dueRansomware use
CISA KEVFeb 11, 2025Mar 4, 2025Not reported
Industry KEV feedFeb 11, 2025Mar 4, 2025Not reported
CIRCL KEVFeb 11, 2025Mar 4, 2025Not reported
ENISA EUVDFeb 11, 2025n/aNot reported

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

Affected Products

33 affected entries in total
ProductAffected versionsFixed in
Windows 10 1507MicrosoftSee advisory10.0.10240.20915
Windows 10 1607MicrosoftSee advisory10.0.14393.7785
Windows 10 1809MicrosoftSee advisory10.0.17763.6893
Windows 10 21h2MicrosoftSee advisory10.0.19044.5487
Windows 10 22h2MicrosoftSee advisory10.0.19045.5487
20 more affected products in the full CVE brief

Patched Releases

Windows 10 1507

10.0.10240.20915

Windows 10 1607

10.0.14393.7785

Windows 10 1809

10.0.17763.6893

Windows 10 21h2

10.0.19044.5487

Windows 10 22h2

10.0.19045.5487

Windows 11 22h2

10.0.22621.4890

Windows 11 23h2

10.0.22631.4890

Windows 11 24h2

10.0.26100.3107

Windows Server 2016

10.0.14393.7785

Windows Server 2019

10.0.17763.6893

Windows Server 2022

10.0.20348.3148, 10.0.20348.3207

Windows Server 2022 23h2

10.0.25398.1425

Windows Server 2025

10.0.26100.3107, 10.0.26100.3194

Windows 10 Version 1507

10.0.10240.20915

Windows 10 Version 1607

10.0.14393.7785

Windows 10 Version 1809

10.0.17763.6893

Windows 10 Version 21H2

10.0.19044.5487

Windows 10 Version 22H2

10.0.19045.5487

Windows 11 version 22H2

10.0.22621.4890

Windows 11 version 22H3

10.0.22631.4890

Windows 11 Version 23H2

10.0.22631.4890

Windows 11 Version 24H2

10.0.26100.3194

Windows Server 2016 (Server Core installation)

10.0.14393.7785

Windows Server 2019 (Server Core installation)

10.0.17763.6893

Windows Server 2022, 23H2 Edition (Server Core installation)

10.0.25398.1425

Timeline

  1. Publicly disclosed

    Feb 11, 2025

  2. Added to CISA KEV

    Feb 11, 2025

  3. Added to Industry KEV feed

    Feb 11, 2025

  4. Added to CIRCL KEV

    Feb 11, 2025

  5. Added to ENISA EUVD

    Feb 11, 2025

  6. Last updated

    Sep 24, 2026

Weakness Type

  • CWE-59 Improper Link Resolution Before File Access ('Link Following')

References

FAQ

Common Questions.

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