This indicates an attack attempt to exploit a Buffer Overflow vulnerability in Dlink DIR Routers.
The vulnerability is caused by an error when handling a malicious HTTP request. A remote attacker may be able to exploit this to execute arbitrary code within the context of the affected application, via a crafted HTTP request.
Dlink DIR-868L (Rev. B and C)
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.