This indicates an attack attempt to exploit a Security Bypass vulnerability in D-Link DIR-600M devices.
This issue is caused by insufficient validation of access to the targeted system. It may allow remote attacker to execute arbitrary code without authentication via a crafted http request.
D-Link DIR-600M devices with firmware 3.04
System Compromise: Remote attackers can gain control of vulnerable systems.
Currently we are unaware of any patches supplied by the vendor for this issue.