I wanted to know if a virus can actually reside in a cable modem and infect a PC. I work in a law office and we keep a few computers off the network for security issues. The situation is I just reformatted a PC, re-installed the OS (Windows XP) and I am about to hook it to the internet to download all the needed updates. Like most small offices we have a cable modem connected to a wifi router that most people in the office use for tablets, cell phones, etc. All these things are personal items and have the ability of contracting virus because of all the internet browsing they do at home, coffee shops, etc. What I figured I would do is disconnect the modem from the router and then hook it directly to the PC then download the updates. I planned on rebooting the modem so nothing is stuck in its memory, but I just wanted to know if I went ahead with the plan above is there any risks of a virus being passed onto the PC that I am updating?
P.S. I have the standard Motorola "Surfboard" cable modem SB5101U