This brings back memories of one time being told by a Cisco engineer in the late 90's or early 2000's that a buffer overflow wasn't a critical issue because it

This brings back memories of one time being told by a Cisco engineer in the late 90's or early 2000's that a buffer overflow wasn't a critical issue because it only impacted the control plane of a router. Oh and I also found out since it was a custom OS without access to source code that it somehow was immune to exploitation. I asked for a different engineer who was much more helpful.