CVE-2021-27104
9.8
CRITICAL
CVSS 3.1
EPSS 56.7% · 99th pctCISA KEV · Exploited in the wild
2021-02-16Updated 2025-10-21KEV 2021-11-03
CISA Known Exploited Vulnerabilities
Accellion FTA OS Command Injection Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
Added to KEV
2021-11-03
Remediation due
2021-11-17
Ransomware
Known use
Required action
Apply updates per vendor instructions.
CISA notes
https://nvd.nist.gov/vuln/detail/CVE-2021-27104
Description
Accellion FTA 9_12_370 and earlier is affected by OS command execution via a crafted POST request to various admin endpoints. The fixed version is FTA_9_12_380 and later.
Severity
CVSS 3.1 · CISA9.8 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSSVC · CISA-ADP
Exploitationactive
Automatableno
Technical impacttotal
Exploitation Context
as of October 13, 2026- CISA added CVE-2021-27104 to the KEV catalog 260 days after its CVE record was published.
- It is one of 4 Accellion entries in the CISA KEV catalog, and one of 4 added in 2021.
- Its current EPSS score (56.7%) is higher than that of 52% of CISA KEV entries.
Affected Products
| Vendor | Product | Affected versions |
|---|---|---|
| - | - | n/a |
References
2 LinksRecord Details
Published
2021-02-16
Last updated
2025-10-21
Assigner (CNA)
mitre
Credited to
-
CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.