This indicates an attack attempt to exploit a Command Injection vulnerability in D-Link DNS-320 Devices.
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, via a crafted HTTP request.
D-Link DNS-320 with firmware version v2.05b10 and prior
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the latest patch from the vendor.