IRONSMITHINTEL
CRITICALCVSS9.8
|
Actively Exploited
|CISA KEV|CVE-2021-40870|Auth: none — unauthenticated|Reboot: required|Manual only

Aviatrix Controller Unrestricted Upload of File

Unrestricted upload of a file with a dangerous type is possible, which allows an unauthenticated user to execute arbitrary code via directory traversal.

Published Sep 13, 2021 · Updated May 16, 2026
Why patchRisk explained in plain English
Worst-case scenarioIf unpatched

A remote attacker, without authentication, can achieve full data confidentiality loss, arbitrary modification of data, complete denial of service or system unavailability. Federal agencies are required to remediate by 2022-02-01 under CISA BOD 22-01.

How the attack worksNo clicks needed

This is a Software Vulnerability (CWE-23) (CWE-23) vulnerability in Aviatrix Aviatrix Controller. 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. Exploitation requires remote network access, low attack complexity, no authentication required, and no user interaction required.

📧

Phishing link

🖼

Malicious file

🔓

Server compromised

Am I affected?Quick check

Probably yes if any of these apply:

IT Security
Running controller: 6.2 ≤ v < 6.2.2043, 6.3 ≤ v < 6.3.2490, 6.4 ≤ v < 6.4.2838, 6.5 ≤ v < 6.5.1922
Real-world incidentsWhat we've seen

Active exploitation documented in the wild. Threat-research write-up: http://packetstormsecurity.com/files/164461/Aviatrix-Controller-6.x-Path-Traversal-Code-Execution.html

How to patch

Manual remediation steps

Apply the Vendor Patch

This vulnerability is in the CISA Known Exploited Vulnerabilities catalog — apply the vendor's security update as soon as possible.

CISA required action: Apply updates per vendor instructions.

References

    1
    Vendor advisory: https://docs.aviatrix.com/HowTos/UCC_Release_Notes.html#security-note-9-11-2021
    1
    NVD entry: https://nvd.nist.gov/vuln/detail/CVE-2021-40870
    1
    CISA KEV: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-40870
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