If you can share the actual source code or more context (firmware version, observed behavior), I can give a line-by-line audit.
http://192.168.2.1/Edimaxext.setup/Index2.asp Edimaxext.setup Index2.asp
or
Some firmware versions use index.asp (without the '2'). Fix: Manually type http://edimaxext.setup/index.asp or http://192.168.2.2/index.asp If you can share the actual source code