CVE-2026-21525

MEDIUMNVD 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
6.2
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 5%CVSS: 6.2Exploit: NoneExposed: 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)
EPSS
91.2%
KEV
⚠ Exploited

Published

February 10, 2026

Last Modified

March 30, 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 104× in last 7d / 433× 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 699 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(6)

What is CVE-2026-21525?
CVE-2026-21525 is a medium 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 March 30, 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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