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 — 3 sources updated this weekExploited in the wild
9.8EG
EchelonGraph verdictMitigate nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 6.0%CVSS: 9.8Exploit: cisa kev · ssvc active · kev ransomwareExposed services: Not assessed

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

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
9.8CRITICALhigh confidence
EG Risk
84
EG Risk 84/100CISA SSVC

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%
CISA SSVC: Track at low, Attend at medium and Act at high mission impact.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low, sooner than that at medium and as soon as possible at high mission impact, and watch the vendor's advisory for the fix.
EPSS PROB
6.0%
EPSS %ILE
93rd
KEV
⚠ Exploited

CISA SSVCTrack at low, Attend at medium and Act at high mission impact.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low, sooner than that at medium and as soon as possible at high mission impact, and watch the vendor's advisory for the fix.

Exploitation active (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

February 16, 2021

Last Modified

November 3, 2025

Advisory Details (1)

Auto-updated Oct 1, 2026
⚠️ Active exploitation confirmed. No fix on record yet. Sources: cisa.
cisa🔴 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 55× in last 7d / 249× 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 1,046 total refreshes for this CVE.

  1. 2026-10-06 19:28 UTCGHSA enrichment
  2. 2026-10-06 15:22 UTCEG score recompute
  3. 2026-10-06 15:22 UTCGHSA enrichment
  4. 2026-10-06 15:14 UTCEPSS rescore
  5. 2026-10-06 11:16 UTCGHSA enrichment
  6. 2026-10-06 07:10 UTCGHSA enrichment
  7. 2026-10-06 03:03 UTCGHSA enrichment
  8. 2026-10-05 22:56 UTCGHSA enrichment
  9. 2026-10-05 18:50 UTCEG score recompute
  10. 2026-10-05 18:50 UTCGHSA enrichment
  11. 2026-10-05 17:40 UTCEPSS rescore
  12. 2026-10-05 14:44 UTCGHSA enrichment
  13. 2026-10-05 10:38 UTCGHSA enrichment
  14. 2026-10-05 06:32 UTCGHSA enrichment
  15. 2026-10-05 02:25 UTCEG score recompute
  16. 2026-10-05 02:25 UTCGHSA enrichment
  17. 2026-10-04 23:19 UTCEPSS rescore
  18. 2026-10-04 22:18 UTCGHSA enrichment
  19. 2026-10-04 18:12 UTCGHSA enrichment
  20. 2026-10-04 14:05 UTCGHSA enrichment
  21. 2026-10-04 09:57 UTCGHSA enrichment
  22. 2026-10-04 05:50 UTCGHSA enrichment
  23. 2026-10-04 01:44 UTCGHSA enrichment
  24. 2026-10-03 21:38 UTCGHSA enrichment
  25. 2026-10-03 17:31 UTCEG score recompute
Show 75 more
  1. 2026-10-03 17:31 UTCGHSA enrichment
  2. 2026-10-03 14:22 UTCEPSS rescore
  3. 2026-10-03 14:22 UTCEPSS rescore
  4. 2026-10-03 13:25 UTCGHSA enrichment
  5. 2026-10-03 09:18 UTCGHSA enrichment
  6. 2026-10-03 05:10 UTCGHSA enrichment
  7. 2026-10-03 01:03 UTCGHSA enrichment
  8. 2026-10-02 20:57 UTCGHSA enrichment
  9. 2026-10-02 16:50 UTCEG score recompute
  10. 2026-10-02 16:50 UTCGHSA enrichment
  11. 2026-10-02 16:22 UTCEPSS rescore
  12. 2026-10-02 12:44 UTCGHSA enrichment
  13. 2026-10-02 08:38 UTCGHSA enrichment
  14. 2026-10-02 04:31 UTCGHSA enrichment
  15. 2026-10-02 00:25 UTCGHSA enrichment
  16. 2026-10-01 20:19 UTCEG score recompute
  17. 2026-10-01 20:18 UTCGHSA enrichment
  18. 2026-10-01 19:46 UTCEPSS rescore
  19. 2026-10-01 16:10 UTCGHSA enrichment
  20. 2026-10-01 12:04 UTCGHSA enrichment
  21. 2026-10-01 07:58 UTCGHSA enrichment
  22. 2026-10-01 03:51 UTCGHSA enrichment
  23. 2026-09-30 23:45 UTCGHSA enrichment
  24. 2026-09-30 19:37 UTCGHSA enrichment
  25. 2026-09-30 15:31 UTCEG score recompute
  26. 2026-09-30 15:31 UTCGHSA enrichment
  27. 2026-09-30 15:00 UTCEPSS rescore
  28. 2026-09-30 11:24 UTCGHSA enrichment
  29. 2026-09-30 07:18 UTCGHSA enrichment
  30. 2026-09-30 03:11 UTCGHSA enrichment
  31. 2026-09-29 23:05 UTCGHSA enrichment
  32. 2026-09-29 18:58 UTCEG score recompute
  33. 2026-09-29 18:57 UTCGHSA enrichment
  34. 2026-09-29 15:15 UTCEPSS rescore
  35. 2026-09-29 14:49 UTCGHSA enrichment
  36. 2026-09-29 10:41 UTCGHSA enrichment
  37. 2026-09-29 06:32 UTCGHSA enrichment
  38. 2026-09-29 02:26 UTCGHSA enrichment
  39. 2026-09-28 22:19 UTCEG score recompute
  40. 2026-09-28 22:19 UTCGHSA enrichment
  41. 2026-09-28 18:13 UTCGHSA enrichment
  42. 2026-09-28 14:04 UTCEG score recompute
  43. 2026-09-28 14:04 UTCGHSA enrichment
  44. 2026-09-28 13:47 UTCEPSS rescore
  45. 2026-09-28 09:57 UTCGHSA enrichment
  46. 2026-09-28 05:50 UTCGHSA enrichment
  47. 2026-09-28 01:43 UTCGHSA enrichment
  48. 2026-09-27 21:51 UTCCISA KEV update
  49. 2026-09-27 21:35 UTCGHSA enrichment
  50. 2026-09-27 17:28 UTCEG score recompute
  51. 2026-09-27 17:28 UTCGHSA enrichment
  52. 2026-09-27 13:41 UTCEPSS rescore
  53. 2026-09-27 13:22 UTCGHSA enrichment
  54. 2026-09-27 09:16 UTCGHSA enrichment
  55. 2026-09-27 05:08 UTCGHSA enrichment
  56. 2026-09-27 01:01 UTCGHSA enrichment
  57. 2026-09-26 20:55 UTCGHSA enrichment
  58. 2026-09-26 16:48 UTCEG score recompute
  59. 2026-09-26 16:47 UTCGHSA enrichment
  60. 2026-09-26 15:54 UTCEPSS rescore
  61. 2026-09-26 15:54 UTCEPSS rescore
  62. 2026-09-26 12:40 UTCGHSA enrichment
  63. 2026-09-26 08:30 UTCGHSA enrichment
  64. 2026-09-26 04:20 UTCEG score recompute
  65. 2026-09-26 04:20 UTCGHSA enrichment
  66. 2026-09-26 00:21 UTCEPSS rescore
  67. 2026-09-26 00:14 UTCGHSA enrichment
  68. 2026-09-25 20:07 UTCGHSA enrichment
  69. 2026-09-25 19:35 UTCCISA KEV update
  70. 2026-09-25 15:57 UTCGHSA enrichment
  71. 2026-09-25 14:55 UTCCISA KEV update
  72. 2026-09-25 11:51 UTCGHSA enrichment
  73. 2026-09-25 07:44 UTCGHSA enrichment
  74. 2026-09-25 03:38 UTCGHSA enrichment
  75. 2026-09-24 23:31 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 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 attention. No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation, and watch the vendor's advisory for the fix.
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.
How do I remediate CVE-2021-27101?
No fix for CVE-2021-27101 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix.

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