“Firewalls and gateway routers are already important components of any organization’s network security strategy. But network architects can often overlook the fact that the networking equipment itself can be attacked. Ensuring these devices are resistant to attacks is just as important as conventional security mechanisms that protect PCs and servers.”
Establishing Network Equipment Security
Click to access Establishing-Network-Equipment-Security.pdf
TCG Guidance for Securing Network Equipment Preview Synopsis
Click to access NetEq-Synopsis_1_0r3.pdf
More info:
http://www.trustedcomputinggroup.org/establishing-network-equipment-security/
Firmware Security 