CVE-2021-27101

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 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 9.8 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
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 6%CVSS: 9.8Exploit: cisa kev · ssvc active · kev ransomwareExposed: 0

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

Accellion FTA 9_12_370 and earlier is affected by SQL injection via a crafted Host header in a request to document_root.html. The fixed version is FTA_9_12_380 and later.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
84(Attend)
EG Risk 84/100SSVC: 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
Severity98% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
6%
EPSS %ILE
93%
KEV
⚠ Exploited

Published

February 16, 2021

Last Modified

November 3, 2025

Advisory Details (1)

Auto-updated Aug 20, 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-2021-27101

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 58× in last 7d / 231× 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 660 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2021-27101?
CVE-2021-27101 is a critical vulnerability published on February 16, 2021. Accellion FTA 912370 and earlier is affected by SQL injection via a crafted Host header in a request to documentroot.html. The fixed version is FTA912380 and later.
When was CVE-2021-27101 disclosed?
CVE-2021-27101 was first published in the National Vulnerability Database on February 16, 2021, with the most recent update on November 3, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-27101 actively exploited?
Yes. CISA added CVE-2021-27101 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Accellion FTA. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2021-27101?
CVE-2021-27101 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2021-27101?
CVE-2021-27101 affects Accellion FTA. 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-2021-27101?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-27101, 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.

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