This indicates an attack attempt to exploit a Code Execution vulnerability in D-Link ShareCenter Products.
The vulnerability is caused by an error in "system_mgr.cgi" when handling http requests with a malicious cmd parameter. It may allow remote attackers to execute arbitrary code by sending a crafted http request.
D-Link DNS-320 ShareCenter
D-Link DNS-325 ShareCenter
System Compromise: Remote attackers can gain control of vulnerable systems.
Currently we are not aware of any vendor supplied patch for this issue.