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Known Exploited Vulnerability
10.0
HIGH CVSS 2.0
CVE-2021-27104
Accellion FTA OS Command Injection Vulnerability - [Actively Exploited]
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.

INFO

Published Date :

Feb. 16, 2021, 9:15 p.m.

Last Modified :

March 14, 2025, 8:48 p.m.

Remotely Exploit :

Yes !

Source :

[email protected]
CISA Notification
CISA KEV (Known Exploited Vulnerabilities)

For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.

Description :

Accellion FTA contains an OS command injection vulnerability exploited via a crafted POST request to various admin endpoints.

Required Action :

Apply updates per vendor instructions.

Notes :

https://nvd.nist.gov/vuln/detail/CVE-2021-27104

Affected Products

The following products are affected by CVE-2021-27104 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Accellion fta
: Total Affected Vendor : 1 | Products : 1
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 2.0 HIGH [email protected]
CVSS 3.1 CRITICAL [email protected]
CVSS 3.1 CRITICAL 134c704f-9b21-4f2e-91b3-4a467353bcc0
Solution
This information is provided by the 3rd party feeds.
  • Update to version 9_12_416 or later, or upgrade to a more secure platform, kiteworks that is currently supported.
Public PoC/Exploit Available at Github

CVE-2021-27104 has a 11 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-27104.

URL Resource
https://github.com/accellion/CVEs/blob/main/CVE-2021-27104.txt Third Party Advisory Broken Link
https://www.accellion.com/products/fta/ Product Vendor Advisory
https://github.com/accellion/CVEs/blob/main/CVE-2021-27104.txt Third Party Advisory Broken Link
https://www.accellion.com/products/fta/ Product Vendor Advisory
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-27104 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-27104 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
overcookedsha/go-kev

Build a local copy of Known Exploited Vulnerabilities Catalog by CISA. Server mode for easy querying.

Dockerfile Makefile Go Python

Updated: 2 months, 3 weeks ago
0 stars 0 fork 0 watcher
Born at : June 2, 2025, 8:27 a.m. This repo has been linked 1 different CVEs too.
Profile Photo
ChalkingCode/ExploitedDucks

A super simple Cisa KEV lookup CLI tool leveraging DuckDB

Python

Updated: 1 year ago
1 stars 0 fork 0 watcher
Born at : July 2, 2024, 7:56 p.m. This repo has been linked 33 different CVEs too.
Profile Photo
takumakume/dependency-track-policy-applier

Manage OWASP Dependency-Track policy idempotent.

Makefile Go Dockerfile

Updated: 1 year, 11 months ago
0 stars 0 fork 0 watcher
Born at : Sept. 1, 2023, 1:22 a.m. This repo has been linked 9 different CVEs too.
Profile Photo
Th0m4s-J4m3s/RSA-Ransomware-for-education-

None

Updated: 3 years, 2 months ago
0 stars 0 fork 0 watcher
Born at : June 9, 2022, 1:30 a.m. This repo has been linked 2 different CVEs too.
Profile Photo
eeenvik1/scripts_for_YouTrack

Набор скриптов для парсинга агрегаторов уязвимостей и выгрузки информации в YouTrack

Python

Updated: 1 month, 2 weeks ago
27 stars 6 fork 6 watcher
Born at : May 17, 2022, 11:34 a.m. This repo has been linked 61 different CVEs too.
Profile Photo
triw0lf/Security-Matters-22

Resources for Security Matters talk 2022

Updated: 3 years, 4 months ago
1 stars 0 fork 0 watcher
Born at : April 20, 2022, 5:31 p.m. This repo has been linked 39 different CVEs too.
Profile Photo
Ostorlab/KEV

Ostorlab KEV: One-command to detect most remotely known exploitable vulnerabilities. Sourced from CISA KEV, Google's Tsunami, Ostorlab's Asteroid and Bug Bounty programs.

cisa-kev vulnerability 0day cisa exploits

Updated: 2 weeks, 3 days ago
581 stars 42 fork 42 watcher
Born at : April 19, 2022, 8:58 a.m. This repo has been linked 1287 different CVEs too.
Profile Photo
Marcuccio/kevin

Prioritize your CVEs

vulnerability-management risk-analysis

Rust

Updated: 1 year, 1 month ago
1 stars 0 fork 0 watcher
Born at : Feb. 21, 2022, 2:08 p.m. This repo has been linked 14 different CVEs too.
Profile Photo
vulsio/go-kev

Build a local copy of Known Exploited Vulnerabilities Catalog by CISA. Server mode for easy querying.

Dockerfile Makefile Go Python

Updated: 1 month, 3 weeks ago
21 stars 7 fork 7 watcher
Born at : Nov. 15, 2021, 4:30 a.m. This repo has been linked 1 different CVEs too.
Profile Photo
accellion/CVEs

None

Updated: 5 months, 4 weeks ago
4 stars 7 fork 7 watcher
Born at : Feb. 17, 2021, 5:25 a.m. This repo has been linked 9 different CVEs too.
Profile Photo
jaychen2/NIST-BULK-CVE-Lookup

NIST BULK CVE Lookup

Python

Updated: 2 years, 4 months ago
0 stars 0 fork 0 watcher
Born at : May 7, 2020, 11:23 p.m. This repo has been linked 5 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-27104 vulnerability anywhere in the article.

  • Cyber Security News
CL0P Ransomware Attacking Telecommunications & Healthcare Sectors In Large Scale

The CL0P ransomware group has intensified attacks on critical infrastructure sectors, with telecommunications and healthcare organizations worldwide reporting mass data breaches and system encryption. ... Read more

Published Date: Feb 21, 2025 (6 months ago)

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2021-27104 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Modified Analysis by [email protected]

    Mar. 14, 2025

    Action Type Old Value New Value
    Changed Reference Type MITRE: https://github.com/accellion/CVEs/blob/main/CVE-2021-27104.txt Types: Third Party Advisory MITRE: https://github.com/accellion/CVEs/blob/main/CVE-2021-27104.txt Types: Broken Link, Third Party Advisory
    Changed Reference Type CVE: https://github.com/accellion/CVEs/blob/main/CVE-2021-27104.txt Types: Third Party Advisory CVE: https://github.com/accellion/CVEs/blob/main/CVE-2021-27104.txt Types: Broken Link, Third Party Advisory
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Feb. 03, 2025

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Added CWE CWE-78
  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://github.com/accellion/CVEs/blob/main/CVE-2021-27104.txt
    Added Reference https://www.accellion.com/products/fta/
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Initial Analysis by [email protected]

    Feb. 17, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:C/I:C/A:C)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type https://github.com/accellion/CVEs/blob/main/CVE-2021-27104.txt No Types Assigned https://github.com/accellion/CVEs/blob/main/CVE-2021-27104.txt Third Party Advisory
    Changed Reference Type https://www.accellion.com/products/fta/ No Types Assigned https://www.accellion.com/products/fta/ Product, Vendor Advisory
    Added CWE NIST CWE-78
    Added CPE Configuration OR *cpe:2.3:a:accellion:fta:*:*:*:*:*:*:*:* versions up to (including) 9_12_370
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 9.8
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact
Base CVSS Score: 10
Access Vector
Access Complexity
Authentication
Confidentiality Impact
Integrity Impact
Availability Impact
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

3.39 }} -0.26%

score

0.86910

percentile