CVE-2021-27104

9.8 criticalKEVEPSS 57%

Critical (9.8) in Accellion FTA. In CISA KEV since 2021-11-03, with known ransomware use. EPSS 57% chance of exploitation in the next 30 days.

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

9.8 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 57% chance of exploitation in the next 30 days; higher than 99% of CVEs (scores of 2026-10-31)
CISA KEV: listed 2021-11-03, due 2021-11-17, known ransomware use
CWE: CWE-78
Published: 2021-02-16
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

accellion:fta

References

https://github.com/accellion/CVEs/blob/main/CVE-2021-27104.txt
https://www.accellion.com/products/fta/
https://github.com/accellion/CVEs/blob/main/CVE-2021-27104.txt
https://www.accellion.com/products/fta/
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27104

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