This indicates an attack attempt to exploit an Information Disclosure vulnerability in Dlink Routers.
The vulnerability is due to insufficient sanitization of user supplied inputs in the application. A remote attacker can exploit this to gain unauthorized access to sensitive information. This exploit has been incorporated into various scanners.
Dlink DIR 8XX routers
Information Disclosure: Remote attackers can gain sensitive information from vulnerable systems.
Currently we are unaware of any vendor supplied patch or updates available for this issue.