The AudioCodes 400HD series of IP phones consists in a range of easy-to-use, feature-rich desktop devices for the service provider hosted services, enterprise IP telephony and contact center markets.

The CGI scripts used on the 420HD phone (web interface) do not filter user inputs correctly. Consequently, an authenticated attacker could inject arbitrary commands (Remote Code Execution) and takes full control over the device. For example, it is possible to intercept live communications.

Vulnerability records

CVE ID: CVE-2018-10093

Access Vector: remote

Security Risk: medium

Vulnerability: CWE-78

CVSS Base Score: 7.2

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


The script command.cgi, used for system monitoring and diagnostics, is vulnerable to a remote command execution attack.

Visiting the /command.cgi?cat%20/etc/passwd gives the following result:


Note that the vulnerable page is only available to authenticated users (in possession of the admin configuration password).

Timeline (dd/mm/yyyy)

  • 06/03/2018 : Initial discovery
  • 17/04/2018 : Vendor contact
  • 17/05/2018 : Vendor technical team acknowledgment
  • 07/01/2019 : Vendor recommendation to mitigate the issue
  • 10/01/2019 : Public disclosure


AudioCodes recommends to change the default admin credentials to mitigate the issue.

Affected versions

Theses vulnerabilities have only been tested on the 420HD phone (firmware version:


a.baube at sysdream dot com