Barracuda Email Security Gateway < Command Injection (CVE-2023-2868)

critical Nessus Plugin ID 177587


A web application running on the remote server is affected by a command injection vulnerability.


According to its self-reported version, the Barracuda Email Security Gateway on the remote web server is <
It is, therefore, affected by a command injection vulnerability in the processing of .tar files that could allow a remote, unauthenticated attacker to execute arbitrary commands with the privileges of the Email Security Gateway.

Barracuda released guidance on May 31, 2023 on the continued exploitation of this vulnerability on small number of already compromised ESG appliances. It urges to discontinue the use of the compromised ESG appliances and to contact Barracuda support to obtain a new ESG virtual or hardware appliance.

The FBI has independently verified that all exploited ESG appliances, even those with patches pushed out by Barracuda, remain at risk for continued computer network compromise from suspected PRC cyber actors exploiting this vulnerability.
It issued a flash alert on Aug 24, 2023 reinforcing Barracuda's warning where it strongly advises all affected ESG appliances to be isolated and replaced immediately, and all networks scanned for connections to the provided list of indicators of compromise.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.


Upgrade to Barracuda Email Security Gateway or later.

See Also

Plugin Details

Severity: Critical

ID: 177587

File Name: barracuda_email_security_gateway_9_2_0_008.nasl

Version: 1.4

Type: remote

Family: CGI abuses

Published: 6/23/2023

Updated: 8/31/2023

Risk Information


Risk Factor: Critical

Score: 9.4


Risk Factor: Critical

Base Score: 10

Temporal Score: 8.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2023-2868


Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.4

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:H/RL:O/RC:C

Vulnerability Information

CPE: x-cpe:/o:barracuda:email_security_gateway

Required KB Items: installed_sw/Barracuda Email Security Gateway

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/20/2023

Vulnerability Publication Date: 5/30/2023

CISA Known Exploited Vulnerability Due Dates: 6/16/2023

Reference Information

CVE: CVE-2023-2868