Is CVE-2021-27104 actively exploited?

Yes. CVE-2021-27104 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-27104 be exploited remotely?

The attack vector of CVE-2021-27104 has not been classified yet.

What is the CVSS score of CVE-2021-27104?

CVE-2021-27104 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-27104

HIGHCISA KEVIN THE WILD

CVE-2021-27104

Published: November 3, 2021

EPSS:8.86%probability of exploitation in 30 daysPercentile:92.4th

Official Description

Accellion FTA contains an OS command injection vulnerability exploited via a crafted POST request to various admin endpoints.

NVD Source

CISA KEV Advisory

Accellion FTA OS Command Injection Vulnerability

Accellion FTA contains an OS command injection vulnerability exploited via a crafted POST request to various admin endpoints.

Added to KEV: 2021-11-03Federal patch deadline: 2021-11-17⚠ USED IN RANSOMWARE CAMPAIGNS

Required Action (CISA)

Apply updates per vendor instructions.

Risk Analysis

This OS command injection vulnerability in Accellion FTA allows an attacker to execute arbitrary commands via crafted POST requests to admin endpoints. Its active exploitation in the wild and inclusion in CISA's KEV catalog signify a critical and immediate risk. The high EPSS score indicates a strong likelihood of exploitation.

This vulnerability is actively being exploited in the wild and is listed in CISA's Known Exploited Vulnerabilities catalog. It allows for OS command injection through crafted POST requests to administrative interfaces.

Recommended Action

Apply all available security updates and patches for Accellion FTA to address this command injection vulnerability. Restrict access to admin endpoints and implement robust input validation to prevent crafted requests.

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-2021-27104 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-2021-27104 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.