CVE-2021-45461

critical

Description

FreePBX, when restapps (aka Rest Phone Apps) 15.0.19.87, 15.0.19.88, 16.0.18.40, or 16.0.18.41 is installed, allows remote attackers to execute arbitrary code, as exploited in the wild in December 2021. The fixed versions are 15.0.20 and 16.0.19.

References

https://www.fortinet.com/blog/threat-research/unveiling-the-weaponized-web-shell-encystphp

https://wiki.freepbx.org/display/FOP/2021-12-21+SECURITY%3A+Potential+Rest+Phone+Apps+RCE

https://community.freepbx.org/t/security-issue-potential-rest-phone-apps-rce/80109

https://community.freepbx.org/t/0-day-freepbx-exploit/80092

Details

Source: Mitre, NVD

Published: 2021-12-22

Updated: 2026-06-17

Risk Information

CVSS v2

Base Score: 7.5

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

Severity: High

CVSS v3

Base Score: 9.8

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

Severity: Critical

EPSS

EPSS: 0.19746

Detections

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