CVE-2025-21391

CRITICALNVD 7.19.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2025-02-11), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 7.1 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 5 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 2%CVSS: 7.1Exploit: cisa kev · ssvc activeExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Windows Storage Elevation of Privilege Vulnerability

CVSS v3
7.1
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
2%
EPSS %ILE
83%
KEV
⚠ Exploited

Published

February 11, 2025

Last Modified

October 27, 2025

Advisory Details (2)

Auto-updated Jun 11, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: microsoft, cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-21391
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21391

Vendor Advisories for CVE-2025-21391(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 95× in last 7d / 399× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 1,443 total refreshes for this CVE.

  1. 2026-09-20 16:07 UTCVendor advisory
  2. 2026-09-20 16:06 UTCGHSA enrichment
  3. 2026-09-20 11:55 UTCVendor advisory
  4. 2026-09-20 11:55 UTCGHSA enrichment
  5. 2026-09-20 07:45 UTCVendor advisory
  6. 2026-09-20 07:45 UTCGHSA enrichment
  7. 2026-09-20 03:33 UTCVendor advisory
  8. 2026-09-20 03:33 UTCGHSA enrichment
  9. 2026-09-19 23:23 UTCVendor advisory
  10. 2026-09-19 23:23 UTCGHSA enrichment
  11. 2026-09-19 19:13 UTCEG score recompute
  12. 2026-09-19 19:13 UTCVendor advisory
  13. 2026-09-19 19:13 UTCGHSA enrichment
  14. 2026-09-19 15:02 UTCVendor advisory
  15. 2026-09-19 15:02 UTCGHSA enrichment
  16. 2026-09-19 10:48 UTCVendor advisory
  17. 2026-09-19 10:48 UTCGHSA enrichment
  18. 2026-09-19 06:38 UTCVendor advisory
  19. 2026-09-19 06:38 UTCGHSA enrichment
  20. 2026-09-19 02:28 UTCVendor advisory
  21. 2026-09-19 02:27 UTCGHSA enrichment
  22. 2026-09-18 22:17 UTCEG score recompute
  23. 2026-09-18 22:17 UTCVendor advisory
  24. 2026-09-18 22:17 UTCGHSA enrichment
  25. 2026-09-18 19:27 UTCEPSS rescore
Show 75 more
  1. 2026-09-18 19:20 UTCCISA KEV update
  2. 2026-09-18 18:07 UTCVendor advisory
  3. 2026-09-18 18:06 UTCGHSA enrichment
  4. 2026-09-18 14:15 UTCCISA KEV update
  5. 2026-09-18 13:51 UTCVendor advisory
  6. 2026-09-18 13:51 UTCGHSA enrichment
  7. 2026-09-18 09:40 UTCVendor advisory
  8. 2026-09-18 09:40 UTCGHSA enrichment
  9. 2026-09-18 05:30 UTCVendor advisory
  10. 2026-09-18 05:30 UTCGHSA enrichment
  11. 2026-09-18 01:19 UTCVendor advisory
  12. 2026-09-18 01:19 UTCGHSA enrichment
  13. 2026-09-17 21:09 UTCEG score recompute
  14. 2026-09-17 21:09 UTCVendor advisory
  15. 2026-09-17 21:09 UTCGHSA enrichment
  16. 2026-09-17 16:58 UTCVendor advisory
  17. 2026-09-17 16:58 UTCGHSA enrichment
  18. 2026-09-17 12:23 UTCVendor advisory
  19. 2026-09-17 12:23 UTCGHSA enrichment
  20. 2026-09-17 08:12 UTCVendor advisory
  21. 2026-09-17 08:12 UTCGHSA enrichment
  22. 2026-09-17 04:02 UTCVendor advisory
  23. 2026-09-17 04:02 UTCGHSA enrichment
  24. 2026-09-16 23:52 UTCVendor advisory
  25. 2026-09-16 23:52 UTCGHSA enrichment
  26. 2026-09-16 19:42 UTCVendor advisory
  27. 2026-09-16 19:42 UTCGHSA enrichment
  28. 2026-09-16 15:32 UTCEG score recompute
  29. 2026-09-16 15:32 UTCVendor advisory
  30. 2026-09-16 15:32 UTCGHSA enrichment
  31. 2026-09-16 14:10 UTCCISA KEV update
  32. 2026-09-16 14:06 UTCEPSS rescore
  33. 2026-09-16 11:22 UTCVendor advisory
  34. 2026-09-16 11:21 UTCGHSA enrichment
  35. 2026-09-16 07:12 UTCEG score recompute
  36. 2026-09-16 07:12 UTCVendor advisory
  37. 2026-09-16 07:12 UTCGHSA enrichment
  38. 2026-09-16 05:13 UTCEPSS rescore
  39. 2026-09-16 03:01 UTCVendor advisory
  40. 2026-09-16 03:01 UTCGHSA enrichment
  41. 2026-09-15 22:51 UTCVendor advisory
  42. 2026-09-15 22:51 UTCGHSA enrichment
  43. 2026-09-15 18:41 UTCVendor advisory
  44. 2026-09-15 18:41 UTCGHSA enrichment
  45. 2026-09-15 14:31 UTCVendor advisory
  46. 2026-09-15 14:31 UTCGHSA enrichment
  47. 2026-09-15 10:20 UTCVendor advisory
  48. 2026-09-15 10:20 UTCGHSA enrichment
  49. 2026-09-15 06:10 UTCEG score recompute
  50. 2026-09-15 06:10 UTCVendor advisory
  51. 2026-09-15 06:10 UTCGHSA enrichment
  52. 2026-09-15 03:09 UTCEPSS rescore
  53. 2026-09-15 02:00 UTCVendor advisory
  54. 2026-09-15 02:00 UTCGHSA enrichment
  55. 2026-09-14 21:49 UTCVendor advisory
  56. 2026-09-14 21:49 UTCGHSA enrichment
  57. 2026-09-14 19:24 UTCCISA KEV update
  58. 2026-09-14 17:39 UTCVendor advisory
  59. 2026-09-14 17:39 UTCGHSA enrichment
  60. 2026-09-14 13:29 UTCVendor advisory
  61. 2026-09-14 13:29 UTCGHSA enrichment
  62. 2026-09-14 09:18 UTCVendor advisory
  63. 2026-09-14 09:18 UTCGHSA enrichment
  64. 2026-09-14 05:08 UTCVendor advisory
  65. 2026-09-14 05:08 UTCGHSA enrichment
  66. 2026-09-14 00:57 UTCVendor advisory
  67. 2026-09-14 00:57 UTCGHSA enrichment
  68. 2026-09-13 20:47 UTCEG score recompute
  69. 2026-09-13 20:47 UTCVendor advisory
  70. 2026-09-13 20:47 UTCGHSA enrichment
  71. 2026-09-13 16:46 UTCEPSS rescore
  72. 2026-09-13 16:36 UTCVendor advisory
  73. 2026-09-13 16:36 UTCGHSA enrichment
  74. 2026-09-13 12:26 UTCVendor advisory
  75. 2026-09-13 12:26 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2025-21391?
CVE-2025-21391 is a critical vulnerability published on February 11, 2025. Windows Storage Elevation of Privilege Vulnerability
When was CVE-2025-21391 disclosed?
CVE-2025-21391 was first published in the National Vulnerability Database on February 11, 2025, with the most recent update on October 27, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-21391 actively exploited?
Yes. CISA added CVE-2025-21391 to the Known Exploited Vulnerabilities catalog on February 11, 2025, affecting Microsoft Windows. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2025-21391?
CVE-2025-21391 has a CVSS v3 base score of 7.1 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2025-21391?
CVE-2025-21391 affects Microsoft Windows. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2025-21391?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-21391, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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