This indicates an attack attempt against a Cross Site Request Forgery vulnerability in D-Link DSL-2740B.
The vulnerability is due to insufficient sanitizing of user supplied inputs in the application when handling a crafted HTTP request. An attacker can exploit this by tricking an unsuspecting user into visiting a malicious webpage, leading to other attacks.
Information Spoofing: Remote attackers can spoof data of vulnerable systems.
Currently we are unaware of any vendor supplied patch for this issue.