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CVE ID: CVE-2021-45461


Remote execution vulnerabilities have been discovered in the ‘Rest Phone apps’ module for FreePBX and PBXact versions 15 and 16.

Discovered By:

Bill Simon


  • CVSS Base Score: 9.8

  • Impact Subscore: 5.4

  • Exploitability Subscore: 3.9

  • CVSS Temporal Score: 9.4

  • CVSS Environmental Score: 7.1

  • Modified Impact Subscore: 3.5

  • Overall CVSS Score: 7.1


Vulnerable software and versions:

The versions listed below:

  • Phone Apps (restapps) versions,,,

The following versions fix:

  • > restapps v15.0.20

  • > restapps v16.0.19

Related Information

Official Bug ticket:

Further Details:

Remote execution vulnerabilities exist in the Restapps / Phone apps module. A URL variable could potentially get passed, allowing an RCE.

The Sangoma and FreePBX team has deemed this a major security issue. We strongly encourage all users of FreePBX Distro to upgrade to the latest version of the Phone Apps (restapps) module. This can be done from the Module Admin GUI or fwconsole. For more information on using Module Admin, please see

Sangoma takes security seriously and requests that any future FreePBX security issue be reported at

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