CVE-2025-21391Windows Storage Elevation of Privilege Vulnerability
- 7.1HighCVSS base score
- 2.3%Exploitation in 30 daysEPSS · top 17% of all CVEs
- YesKnown exploitedin CISA's KEV since 11 Feb 2025
- YesPublic exploitsa reference or SSVC says so
Description
Windows Storage Elevation of Privilege Vulnerability
Exploited in the wild
CISA lists this vulnerability in its Known Exploited Vulnerabilities catalog as Microsoft Windows Storage Link Following Vulnerability.
- Added
- 11 Feb 2025
- Fix due (US federal)
- 4 Mar 2025
- Used by ransomware
- Not known
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
ENISA's EU Vulnerability Database lists it as exploited, from CISA's KEV, since 11 Feb 2025.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. CISA's SSVC rates its exploitation: it is being exploited.
Timeline
ID reserved
By microsoft
- 2 months later
· 2 months later
Published
Added to CISA KEV
Known exploited in the wild
- 13 months later
· 13 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| microsoftCNA (assigner) | 3.1 | High7.1 | 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 |
| NVDNVD · Analyzed | 3.1 | High7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H |
- EPSS (exploitation in 30 days)
- 2.3% · top 17% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: active · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.
Affected products
Microsoft · Windows 10 Version 1507
- affected 10.0.10240.0 – < 10.0.10240.20915
Microsoft · Windows 10 Version 1607
- affected 10.0.14393.0 – < 10.0.14393.7785
Microsoft · Windows 10 Version 1809
- affected 10.0.17763.0 – < 10.0.17763.6893
Microsoft · Windows 10 Version 21H2
- affected 10.0.19044.0 – < 10.0.19044.5487
Microsoft · Windows 10 Version 22H2
- affected 10.0.19045.0 – < 10.0.19045.5487
Microsoft · Windows 11 version 22H2
- affected 10.0.22621.0 – < 10.0.22621.4890
Microsoft · Windows 11 version 22H3
- affected 10.0.22631.0 – < 10.0.22631.4890
Microsoft · Windows 11 Version 23H2
- affected 10.0.22631.0 – < 10.0.22631.4890
Microsoft · Windows 11 Version 24H2
- affected 10.0.26100.0 – < 10.0.26100.3194
Microsoft · Windows Server 2016
- affected 10.0.14393.0 – < 10.0.14393.7785
Microsoft · Windows Server 2016 (Server Core installation)
- affected 10.0.14393.0 – < 10.0.14393.7785
Microsoft · Windows Server 2019
- affected 10.0.17763.0 – < 10.0.17763.6893
Microsoft · Windows Server 2019 (Server Core installation)
- affected 10.0.17763.0 – < 10.0.17763.6893
Microsoft · Windows Server 2022
- affected 10.0.20348.0 – < 10.0.20348.3207
Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)
- affected 10.0.25398.0 – < 10.0.25398.1425
Microsoft · Windows Server 2025
- affected 10.0.26100.0 – < 10.0.26100.3194
Microsoft · Windows Server 2025 (Server Core installation)
- affected 10.0.26100.0 – < 10.0.26100.3194
References
References2
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- CISA KEV catalog (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-2452 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-21391)Record last updated .