I'm attempting to gain super user access to my router. I own the router but I'm attempting to do this as if I didn't. The default password is the serial number. Ports 80 and 443 are the only two fully open, unfiltered ports. I've attempted to telnet (always disconnected) and I've attempted to TFTP and extract the configuration file. I'd like to save brute forcing the password for last, if possible.

What tools can be aimed at the router to gain access? Is there an attack that I can do to force it to reveal the serial number?

I have researched this into the ground and can't find a solid answer beyond brute forcing the router login.

Router Specs: Verizon FiOS Actiontec MI424WR

Any questions, please let me know.