CVE-2021-27104Actively exploitedAdded to KEV 2021-11-03Known ransomware campaign use

Accellion FTA OS Command Injection Vulnerability

Accellion, FTA

Description

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

CVSS severity for this advisory hasn't been enriched from NVD yet, check back shortly.

EPSS, exploit probability

Critical

56.7%

estimated chance of real-world exploitation in the next 30 days, higher than 99.1% of every CVE FIRST.org scores

Refreshed 10/28/2026, via FIRST.org's EPSS model, not CVSS, this measures likelihood of exploitation, not how severe it would be.

Required action

Apply updates per vendor instructions.

CISA-recommended due date: 2021-11-17

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