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CVE-2021-27104: Accellion FTA OS Command Injection Vulnerability
Accellion FTA · in CISA KEV since 2021-11-03
2021-11-03added to KEV
2021-11-17federal remediation due date
56.69%EPSS exploit probability (30 days) 99.0th percentile
9.8 CRITICALCVSS 3.1
Knownknown ransomware use
260days from NVD publication to KEV
What it is
Accellion FTA contains an OS command injection vulnerability exploited via a crafted POST request to various admin endpoints.
Required action (CISA)
Apply updates per vendor instructions.
| CWE | CWE-20;CWE-78 |
|---|---|
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD published | 2021-02-16 (Analyzed) |
Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2021-27104.json · all KEV CVEs
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Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.