November 3, 2021 · Applied Cybernetics Group
CVE-2021-27104 — Accellion FTA
known ransomware use
Accellion FTA OS Command Injection Vulnerability
- Added to KEV
2021-11-03- Federal due date
2021-11-17- Vendor
- Accellion
- Product
- FTA
- EPSS
- 91.2th percentile (score 0.064, as of
2026-06-08) - NVD CVSS v3.1
- —
- Ransomware use
- Known
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2021-27104
CISA short description
Accellion FTA contains an OS command injection vulnerability exploited via a crafted POST request to various admin endpoints.
Required action
Apply updates per vendor instructions.