This is was a fun little project and vulnerability that I found On my ISP router. I could access all of the home user routers of my ISP and see their wifi password. This was possible since they did not have a firewall to block requests from my router to the other routers on the network(VPN). This script manages to brute-force and find all IPs of every router and I could open their router settings and login with the default username and password, admin:amdin. At the time of speaking this is patched!