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.
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-40870
https://wearetradecraft.com/advisories/tc-2021-0002/
https://docs.aviatrix.com/HowTos/UCC_Release_Notes.html#security-note-9-11-2021