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
9.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 93%CVSS: 9.8Exploit: NoneExposed: 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)
EPSS
99.8%
KEV
⚠ Exploited

Published

September 13, 2021

Last Modified

November 10, 2025

Advisory Details (2)

Auto-updated Jun 1, 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/

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 55× in last 7d / 211× 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 372 total refreshes for this CVE.

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

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 ↗

Related CVEs(same CWE)

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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