Which products and versions are affected by CVE-2021-40870?

Affected: Controller (Aviatrix). The full list is in the CVE brief.

Is CVE-2021-40870 being exploited in the wild?

It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Dec 21, 2021.

Is CVE-2021-40870 in the CISA KEV catalog?

Yes. It was added on Jan 18, 2022 with a federal remediation due date of Feb 1, 2022.

Is there a public exploit for CVE-2021-40870?

Public exploit code is available.

Is there a fix for CVE-2021-40870?

Fixed versions are available, including Controller 6.2.2043.

How urgently should CVE-2021-40870 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2021-40870

CriticalExploitedPublic exploit

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 Nov 10, 2025

Key Facts

Patch immediately

CVE-2021-40870 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Controller (Aviatrix).
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Dec 21, 2021. Public exploit code is available.
EPSS estimates a 93% probability of exploitation in the next 30 days.
Fixed versions are available, including Controller 6.2.2043.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

9.8

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

EPSS (30-day exploit likelihood)

93%

Higher than 99.8% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2021-40870 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

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.

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
CISA KEV	Jan 18, 2022	Feb 1, 2022	Not reported
Industry KEV feed	Dec 21, 2021	Feb 1, 2022	Not reported
CIRCL KEV	Jan 18, 2022	Feb 1, 2022	Not reported
ENISA EUVD	Jan 18, 2022	n/a	Not reported

Required action: Apply updates per vendor instructions.

Affected Products

1 affected entries in total

Product	Affected versions	Fixed in
ControllerAviatrix	See advisory	6.2.2043

Patched Releases

Controller

6.2.2043

Timeline

Publicly disclosed
Sep 13, 2021
Added to Industry KEV feed
Dec 21, 2021
Added to CISA KEV
Jan 18, 2022
Added to CIRCL KEV
Jan 18, 2022
Added to ENISA EUVD
Jan 18, 2022
Last updated
Nov 10, 2025

Weakness Type

CWE-23 Relative Path Traversal

References

9 more references in the full CVE brief

FAQ

Common Questions.

An issue was discovered in Aviatrix Controller 6.x before 6.5-1804.1922.
Affected: Controller (Aviatrix). The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Dec 21, 2021.
Yes. It was added on Jan 18, 2022 with a federal remediation due date of Feb 1, 2022.
Public exploit code is available.
Fixed versions are available, including Controller 6.2.2043.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Is CVE-2021-40870 Running On Your Attack Surface?

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