CVE-2021-27104

CRITICAL KEV RANSOMWARE

Accellion FTA < 9_12_370 - OS Command Injection via Crafted POST Request

Title source: llm
STIX 2.1

Exploitation Summary

CVE-2021-27104 is actively exploited and listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added November 3, 2021, with confirmed use in ransomware campaigns.

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.

References (3)

Core 3
Core References
Product, Vendor Advisory x_refsource_misc
https://www.accellion.com/products/fta/
Broken Link, Third Party Advisory x_refsource_misc
https://github.com/accellion/CVEs/blob/main/CVE-2021-27104.txt

Scores

CVSS v3 9.8
EPSS 0.0639
EPSS Percentile 91.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation active
Automatable no
Technical Impact total

Details

CISA KEV 2021-11-03
VulnCheck KEV 2021-04-13
InTheWild.io 2021-03-04
ENISA EUVD EUVD-2021-13874
Ransomware Use Confirmed
CWE
CWE-78
Status published
Products (1)
accellion/fta < 9_12_370
Published Feb 16, 2021
KEV Added Nov 03, 2021
Tracked Since Feb 18, 2026