This indicates an attack attempt against a Remote Code Execution vulnerability in D-Link DCS network cameras.
The vulnerability is caused by an improper validation of user supplied data when the vulnerable application handles a maliciously crafted file upload request. An attacker can exploit this to gain access to execute arbitrary code in the context of the vulnerable application via a crafted request.
D-Link DCS-931L firmware version 1.04_B1 and prior
System Compromise: Remote attacker can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.