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ExploitedIn CISA KEVFix available

CVE-2021-40870

Exploitation confirmed. First attested on 2022-01-18 by CISA-ADP, CISA KEV, GCVE · kevintel, GCVE · shadowserver.

  • Published2021-09-13
  • Fixed in6.5.1922 · 6.4.2838 · 6.3.2490 · 6.2.2043
  • WeaknessCWE-23

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2021-09-1308:15CVE publishedNVD
  2. 2022-01-18Added to the CISA KEV catalogCISA KEV
  3. 2022-01-18Listed as exploited by GCVEGCVE
  4. 2022-01-18Exploitation first reportedCISA KEV
  5. 2025-02-0419:36SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 15:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-40870?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-40870?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Aviatrix controller
BranchAffectedFixed in
6.5≥ 6.5, < 6.5.19226.5.1922
6.4≥ 6.4, < 6.4.28386.4.2838
6.3≥ 6.3, < 6.3.24906.3.2490
6.2≥ 6.2, < 6.2.20436.2.2043

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Aviatrix controller to 6.5.1922 · 6.4.2838 · 6.3.2490 · 6.2.2043
  2. CISA’s required action: Apply updates per vendor instructions.due 2022-02-01

Advisories and patches

Detection

read 2026-11-02 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
4 repositories, unverifiedSystem00-Security/CVE-2021-408700xAgun/CVE-2021-40870orangmuda/CVE-2021-40870JoyGhoshs/CVE-2021-40870
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2022-01-18
Patch Due Date
2022-02-01
Ransomware Use
Unknown
Required Action
Apply updates per vendor instructions.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2021-09-13
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-w7mg-q4hh-m9cq

Frequently asked questions

What is CVE-2021-40870?

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.

Is CVE-2021-40870 actively exploited?

Yes. CVE-2021-40870 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-02-01.

What is the CVSS score for CVE-2021-40870?

CVE-2021-40870 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Same product first, then the same vendor advisory and the same publication week.

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Sources for this record