CVE-2026-21525

CRITICALNVD 6.29.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-02-10), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 6.2 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: 5%CVSS: 6.2Exploit: cisa kev · ssvc activeExposed: 0

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

Null pointer dereference in Windows Remote Access Connection Manager allows an unauthorized attacker to deny service locally.

CVSS v3
6.2
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
5%
EPSS %ILE
91%
KEV
⚠ Exploited

Published

February 10, 2026

Last Modified

June 17, 2026

Advisory Details (4)

Auto-updated Jun 13, 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-2026-21525
generic🔴 Active Exploitation

CVE-2026-21525 Mitigation Script - DoS Vulnerability in Windows Remote Access Connection Manager - vsociety

https://www.vicarius.io/vsociety/posts/cve-2026-21525-mitigation-script-dos-vulnerability-in-windows-remote-access-connection-manager
generic🔴 Active Exploitation

CVE-2026-21525 Detection Script - DoS Vulnerability in Windows Remote Access Connection Manager - vsociety

https://www.vicarius.io/vsociety/posts/cve-2026-21525-detection-script-dos-vulnerability-in-windows-remote-access-connection-manager
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-2026-21525

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 93× in last 7d / 411× 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 874 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2026-21525?
CVE-2026-21525 is a critical vulnerability published on February 10, 2026. Null pointer dereference in Windows Remote Access Connection Manager allows an unauthorized attacker to deny service locally.
When was CVE-2026-21525 disclosed?
CVE-2026-21525 was first published in the National Vulnerability Database on February 10, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-21525 actively exploited?
Yes. CISA added CVE-2026-21525 to the Known Exploited Vulnerabilities catalog on February 10, 2026, affecting Microsoft Windows. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2026-21525?
CVE-2026-21525 has a CVSS v3 base score of 6.2 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2026-21525?
CVE-2026-21525 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-2026-21525?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-21525, 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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