The issue is related to incorrect code generation control in the Zabbix monitoring system. It allows a remote attacker to execute arbitrary code. Setting SMS media allows configuring a GSM modem file, which is later used as a Linux device. However, since everything is a file in Linux, it is possible to configure another file, such as a log file, and the zabbix server will attempt to communicate with it as a modem. As a result, the log file will be broken with AT commands, and a small part of the log file content will be leaked to the UI.