CVE-2021-40870 — Aviatrix Controller Unrestricted Upload of File

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.

01What is this vulnerability?

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.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2022-01-18. Ransomware use: Unknown.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

Open in Sigma generator →

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2021-09-13T07:41:55.000Z
• Last modified: 2025-10-21T23:25:33.924Z
• Added to CISA KEV: 2022-01-18
• BOD 22-01 due: 2022-02-01

09References

• docs.aviatrix.com — https://docs.aviatrix.com/HowTos/UCC_Release_Notes.html#security-note-9-11-2021
• wearetradecraft.com — https://wearetradecraft.com/advisories/tc-2021-0002/
• packetstormsecurity.com — http://packetstormsecurity.com/files/164461/Aviatrix-Controller-6.x-Path-Travers…