This indicates an attack attempt to exploit a Directory Traversal vulnerability in D-Link DWR-116.
The vulnerability is due to an error in the vulnerable application when handling a maliciously crafted request. A remote attacker may be able to exploit this to read arbitrary files on the system, via a crafted request.
D-Link DWR-116 with firmware before V1.05b09
Information Disclosure: Remote attackers can gain sensitive information from vulnerable systems.
Apply the most recent upgrade or patch from the vendor.