This indicates an attack attempt to exploit an Authentication Bypass Vulnerability in Arcadyan Routers.
This vulnerability is due to improper handling of the parameters in the vulnerable application. A remote attacker could exploit this vulnerability by sending a crafted HTTP request to the target device. Successful exploitation of the vulnerability could lead to execution of arbitrary code.
Buffalo WSR-2533DHPL2 firmware 1.02 and earlier versions
Buffalo WSR-2533DHP3 firmware 1.24 and earlier versions
System Compromise: Remote attackers can gain control of vulnerable systems.
Currently we are not aware of any vendor supplied patch for this issue.