This indicates an attack attempt to exploit an OS Command Injection vulnerability in OpenNetAdmin.
The vulnerability is due to insufficient sanitizing of user supplied inputs in the application. A remote attacker may be able to exploit this to execute arbitrary commands within the context of the application.
OpenNetAdmin version 8.5.14 to 18.1.1
System Compromise: Remote attackers can gain control of vulnerable systems.
Currently we are unaware of any vendor supplied patch or updates for this issue.