CVE-2021-40870

Name: CVE-2021-40870
Creator: NVD / NIST
Published: 2021-09-13T08:15:13.913+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10Actively ExploitedEPSS 92.38%

Last modified Jun 17, 2026

CVE-2021-40870 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. CISA has confirmed active exploitation in the wild. EPSS estimates a 92.38% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

92.38%

99.8th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Feb 1, 2022.

Weakness Enumeration

CWE-23

Affected Software

Vendor	Product	Versions
Aviatrix	Controller	>= 6.2, < 6.2.2043
Aviatrix	Controller	>= 6.3, < 6.3.2490
Aviatrix	Controller	>= 6.4, < 6.4.2838
Aviatrix	Controller	>= 6.5, < 6.5.1922

References

http://packetstormsecurity.com/files/164461/Aviatrix-Controller-6.x-Path-Traversal-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
https://docs.aviatrix.com/HowTos/UCC_Release_Notes.html#security-note-9-11-2021Release Notes, Vendor Advisory
https://wearetradecraft.com/advisories/tc-2021-0002/Exploit, Third Party Advisory
http://packetstormsecurity.com/files/164461/Aviatrix-Controller-6.x-Path-Traversal-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
https://docs.aviatrix.com/HowTos/UCC_Release_Notes.html#security-note-9-11-2021Release Notes, Vendor Advisory
https://wearetradecraft.com/advisories/tc-2021-0002/Exploit, Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-40870US Government Resource

Timeline

Published: Sep 13, 2021
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2021-40870?

How severe is CVE-2021-40870?

CVE-2021-40870 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 92.38% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2021-40870?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-40870?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST