This indicates an attack attempt to exploit a Command Execution vulnerability in Dlink Routers.
The vulnerability is due to insufficient sanitization 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, via a series of crafted requests.
Dlink DIR 8XX routers
System Compromise: Remote attackers can gain control of vulnerable systems.
Currently we are unaware of any vendor supplied patch or updates available for this issue.