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CVE-2021-40870

97
FAUCET Score

CVE-2021-40870 is a critical vulnerability affecting Aviatrix Controller 6.x before version 6.5-1804.1922, allowing unauthenticated attackers to upload dangerous file types and execute arbitrary code via directory traversal. This vulnerability has a CVSS score of 9.8, indicating a severe risk with low attack complexity and complete compromise of confidentiality, integrity, and availability. It is actively exploited in the wild, as confirmed by its presence in CISA's KEV catalog, and has publicly available Nuclei templates for remote command execution. The high EPSS score and significant community discussion further underscore its immediate threat.

Impacted Technologies

VendorProductVersion(s)CPE
>= 6.2, < 6.2.2043CPE matchmatch criteria
cpe:2.3:a:aviatrix:controller:*:*:*:*:*:*:*:*
>= 6.3, < 6.3.2490CPE matchmatch criteria
cpe:2.3:a:aviatrix:controller:*:*:*:*:*:*:*:*
>= 6.4, < 6.4.2838CPE matchmatch criteria
cpe:2.3:a:aviatrix:controller:*:*:*:*:*:*:*:*
>= 6.5, < 6.5.1922CPE matchmatch criteria
cpe:2.3:a:aviatrix:controller:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
93.02%
Probability of exploitation in next 30 days
EPSS Percentile
99.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Added to KEV · Jan 18, 2022
Nuclei: CVE-2021-40870 · Sep 30, 2021
This CVE's current EPSS score of 0.9302 is in the 99th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

cisa.gov / known-exploited-vulnerabilities-catalog
US Government Resource
packetstormsecurity.com / files/164461/Aviatrix-Controller-6.x-Path-Traversal-Code-Execution.html
ExploitThird Party AdvisoryVDB Entry
docs.aviatrix.com / HowTos/UCC_Release_Notes.html
Release NotesVendor Advisory
wearetradecraft.com / advisories/tc-2021-0002
ExploitThird Party Advisory