CVE-2019-9971: 3cx Phone System Firmware

High severity, CVSS 8.8. EPSS: 1.7% chance of exploitation in the next 30 days.

PhoneSystem Terminal in 3CX Phone System (Debian based installation) 16.0.0.1570 allows an attacker to gain root privileges by using sudo with the tcpdump command, without a password. This occurs because the -z (aka postrotate-command) option to tcpdump can be unsafe when used in conjunction with sudo.

Affected products

• 3cx Phone System Firmware: version 16.0.0.1570 only
• Debian Debian Linux: affected versions not specified

Published 2022-06-07. Last modified 2026-06-17.