CVE-2021-40870

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 2022-01-18), 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: 93%CVSS: 9.8Exploit: cisa kev · ssvc active · epss top5pct · epss high · public exploitExposed: 0

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

An issue was discovered in Aviatrix Controller 6.x before 6.5-1804.1922. Unrestricted upload of a file with a dangerous type is possible, which allows an unauthenticated user to execute arbitrary code via directory traversal.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
99(Act)
EG Risk 99/100SSVC: Act

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%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS PROB
93%
EPSS %ILE
100%
KEV
⚠ Exploited

Published

September 13, 2021

Last Modified

November 10, 2025

Advisory Details (3)

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-2021-40870
generic🟡 PoC Available

Unrestricted upload of file with dangerous type in Aviatrix allows an authenticated user to execute arbitrary code — Tradecraft

https://wearetradecraft.com/advisories/tc-2021-0002/
generic

Banned | Packet Storm

http://packetstormsecurity.com/files/164461/Aviatrix-Controller-6.x-Path-Traversal-Code-Execution.html

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 51× in last 7d / 219× 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 775 total refreshes for this CVE.

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

Publicly available exploits

(4 references)

Working exploit code is in the public domain (3 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCJoyGhoshs/CVE-2021-40870
    First seen Oct 8, 2021

    Unrestricted upload of file with dangerous type in Aviatrix allows an authenticated user to execute arbitrary code

    Open source ↗
  • GitHub PoC0xAgun/CVE-2021-40870
    First seen Oct 7, 2021

    Aviatrix Controller 6.x before 6.5-1804.1922. Unrestricted upload of a file which allows an unauthenticated user to execute arbitrary code via directory traversal

    Open source ↗
  • GitHub PoCorangmuda/CVE-2021-40870
    First seen Oct 7, 2021

    Aviatrix allows an authenticated user to execute arbitrary code

    Open source ↗
  • Nucleihttp/cves/2021/CVE-2021-40870.yaml
    First seen Jan 1, 2021

    Aviatrix Controller 6.x before 6.5-1804.1922 - Remote Command Execution

    Open source ↗

Frequently asked(6)

What is CVE-2021-40870?
CVE-2021-40870 is a critical vulnerability published on September 13, 2021. An issue was discovered in Aviatrix Controller 6.x before 6.5-1804.1922. Unrestricted upload of a file with a dangerous type is possible, which allows an unauthenticated user to execute arbitrary code via directory traversal.
When was CVE-2021-40870 disclosed?
CVE-2021-40870 was first published in the National Vulnerability Database on September 13, 2021, with the most recent update on November 10, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-40870 actively exploited?
Yes. CISA added CVE-2021-40870 to the Known Exploited Vulnerabilities catalog on January 18, 2022, affecting Aviatrix Aviatrix Controller. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2021-40870?
CVE-2021-40870 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2021-40870?
CVE-2021-40870 affects Aviatrix Aviatrix Controller. 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-2021-40870?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-40870, 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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