This indicates an attack attempt against a stack Buffer Overflow vulnerability in D-Link DSP-W215 and DIR-505 device.
The vulnerability is due to insufficient sanitizing of user supplied inputs in the application when handling a crafted HTTP request. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application, via a crafted request to the vulnerable service.
D-Link DSP-W215 v1.01b06
D-Link DIR-505 v1.07 and prior
D-Link DIR-505L v1.01
System Compromise: Remote attackers can execute arbitrary code in the context of the affected application.
Apply the most recent upgrade or patch from the vendor.