Well after reading about what these do (some time ago) I thought cisco routers were wide open out of the box. However while doing a lab, I ran n.map on my one of my routers this is what I found:
Not shown: 997 closed ports
PORT STATE SERVICE VERSION
23/tcp open telnet Cisco router
1720/tcp open H.323/Q.931?
5060/tcp open sip-proxy Cisco SIP Gateway (IOS 12.x)
MAC Address: 00:11:93:CA:E4:A4 (Cisco Systems)
Not the big wide open box I would have thought. Also there were only 3 services running. I have not run auto-secure or security audit on this box yet. What gives? Why so few open ports? I can post my config if that helps.
