This indicates an attack attempt to exploit a Remote Command Injection vulnerability in Belkin Router.
The vulnerability is due to insufficient sanitizing of user supplied inputs passed to the http management interface. A remote attacker may be able to exploit this to execute arbitrary commands within the context of the application.
Belkin Play Max F7D4401 - Ver. 1.00.46
Belkin Play Max F7D4301 - Ver. 1.00.46
System Compromise: Remote attackers can gain control of vulnerable systems.
Currently we are unaware of any vendor supplied patch for this issue.