CVE-2021-27103

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: 11%CVSS: 9.8Exploit: cisa kev · ssvc active · kev ransomware · epss top5pctExposed: 0

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

Accellion FTA 9_12_411 and earlier is affected by SSRF via a crafted POST request to wmProgressstat.html. The fixed version is FTA_9_12_416 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
11%
EPSS %ILE
96%
KEV
⚠ Exploited

Published

February 16, 2021

Last Modified

November 3, 2025

Advisory Details (1)

Auto-updated Sep 17, 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-2021-27103

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 61× in last 7d / 264× 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 951 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2021-27103?
CVE-2021-27103 is a critical vulnerability published on February 16, 2021. Accellion FTA 912411 and earlier is affected by SSRF via a crafted POST request to wmProgressstat.html. The fixed version is FTA912_416 and later.
When was CVE-2021-27103 disclosed?
CVE-2021-27103 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-2021-27103 actively exploited?
Yes. CISA added CVE-2021-27103 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-2021-27103?
CVE-2021-27103 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2021-27103?
CVE-2021-27103 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-2021-27103?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-27103, 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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