This indicates an attack attempt to exploit a Remote Code Execution Vulnerability in Ajenti.
The vulnerability is due to insufficient sanitizing of user supplied inputs in the application. A remote, unauthenticated attacker can exploit this vulnerability via crafted HTTP requests. Successful exploitation could result in arbitrary code execution in the context of the server application.
Ajenti version 2.1.31
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.