Is CVE-2021-40870 actively exploited?

Yes. CVE-2021-40870 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-40870 be exploited remotely?

The attack vector of CVE-2021-40870 has not been classified yet.

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

CVE-2021-40870 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-40870

HIGHCISA KEVIN THE WILD

CVE-2021-40870

Published: January 18, 2022

EPSS:94.26%probability of exploitation in 30 daysPercentile:99.9th

Official Description

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

NVD Source

CISA KEV Advisory

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.

Added to KEV: 2022-01-18Federal patch deadline: 2022-02-01

Required Action (CISA)

Apply updates per vendor instructions.

Risk Analysis

This vulnerability allows an unauthenticated user to upload files with dangerous types, which can then be used to execute arbitrary code through directory traversal. With an EPSS score of 0.94260, there is a very high probability of this flaw being exploited, and it is confirmed to be actively exploited.

This vulnerability is actively exploited in the wild, indicating that functional exploits are readily available and being used by threat actors. The flaw is remotely exploitable by unauthenticated users.

Recommended Action

Implement strict file upload validation to ensure only allowed file types are uploaded and that file paths are properly sanitized. Regularly review and update web server configurations to prevent directory traversal.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2021-40870 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2021-40870 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.