Get the Whitepaper called Cisco IOS Router Exploitation. This paper describes the challenges with the exploitation of memory corruption software vulnerabilities in Cisco IOS. The goal is to map out the problem space in order to allow for the anticipation of developments in the future, as current research suggests that exploitation of such vulnerabilities in the wild is not currently the case. By understanding the challenges that an attacker faces, defensive strategies can be better planned, a required evolution with the current state of Cisco IOS router networks.
You can download it from the following link: https://packetstormsecurity.com/files/download/97330/ios-exploitation.pdf
Source: https://packetstormsecurity.com/files/97330/Cisco-IOS-Router-Exploitation.html