This indicates an attack attempt to exploit a remote Code Execution vulnerability in NetGear DGN series routers.
The vulnerability is due to an error in the application when handling a crafted HTTP request. It may allow remote attackers to execute arbitrary code on vulnerable systems via a crafted HTTP request.
Netgear DGN1000 firmware version 1.1.00.48 and prior
Netgear DGN2200 v1
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply latest patch from the Vendor.