CVE-2021-22894

HIGHNVD 8.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 8.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
8.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 41%CVSS: 8.8Exploit: NoneExposed: 0

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

A buffer overflow vulnerability exists in Pulse Connect Secure before 9.1R11.4 allows a remote authenticated attacker to execute arbitrary code as the root user via maliciously crafted meeting room.

CVSS v3
8.8
EG Score
9.0(high)
EPSS
98.5%
KEV
⚠ Exploited

Published

May 27, 2021

Last Modified

December 18, 2025

Advisory Details (1)

Auto-updated Jun 2, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: 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-2021-22894

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 100× in last 7d / 416× 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 623 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2021-22894?
CVE-2021-22894 is a high vulnerability published on May 27, 2021. A buffer overflow vulnerability exists in Pulse Connect Secure before 9.1R11.4 allows a remote authenticated attacker to execute arbitrary code as the root user via maliciously crafted meeting room.
When was CVE-2021-22894 disclosed?
CVE-2021-22894 was first published in the National Vulnerability Database on May 27, 2021, with the most recent update on December 18, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-22894 actively exploited?
Yes. CISA added CVE-2021-22894 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Ivanti Pulse Connect Secure. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2021-22894?
CVE-2021-22894 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2021-22894?
CVE-2021-22894 affects Ivanti Pulse Connect Secure. 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-2021-22894?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-22894, 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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