Our friends over at TechWarn have their take on routers vulnerable to virus attacks
Big price differences between routers are often confusing to consumers as, unlike with personal computers, the quality difference is not always obvious. As routers are normally tied to a physical location, it is also rather difficult to test their reliability in different environments, unlike with highly mobile laptops or smartphones.
Routers often do not receive updates, or updates have to be manually downloaded and applied — a cumbersome process that is not an attractive option to many non-tech-savvy users.
Routers are desirable targets for attackers as they sit at a very sensitive spot on a network — right at the edge. They are a centralized point and connected to every single device in the network. Routers read all of the data that each device sends to the Internet, and if these connections are unencrypted, the router could easily inject malicious scripts and links.