rConfig 3.9.2 is susceptible to a remote code execution vulnerability. An attacker can directly execute system commands by sending a GET request to ajaxServerSettingsChk.php because the rootUname parameter is passed to the exec function without filtering, which can lead to command execution.
View the template here CVE-2019-16662.yaml
References:
https://drive.google.com/open?id=1OXI5cNuwWqc6y-7BgNCfYHgFPK2cpvnu