CVE-2021-27104

9.8 CRITICAL CISA KEV - Actively Exploited

Published: February 16, 2021 Modified: November 03, 2025

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.

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

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

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

https://github.com/accellion/CVEs/blob/main/CVE-2021-27104.txt

Source: cve@mitre.org

Broken Link Third Party Advisory

https://www.accellion.com/products/fta/

Source: cve@mitre.org

Product Vendor Advisory

https://github.com/accellion/CVEs/blob/main/CVE-2021-27104.txt

Source: af854a3a-2127-422b-91ae-364da2661108

Broken Link Third Party Advisory

https://www.accellion.com/products/fta/

Source: af854a3a-2127-422b-91ae-364da2661108

Product Vendor Advisory

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27104

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

US Government Resource

5 reference(s) from NVD

Quick Stats

CVSS v3 Score

9.8 / 10.0

EPSS (Exploit Probability)

2.4%

85th percentile

Exploitation Status

Actively Exploited

Remediation due: 2021-11-17

Weaknesses (CWE)

CWE-78 CWE-78

Affected Vendors

accellion

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