The FBI has issued an important warning about certain consumer-class routers after a massive malware attack was detected. Turning the router off, then on again is a simple and important step to help stop the malware. Additionally, it's recommended that you update the password and make sure the firmware is up to date. The malware is capable of blocking traffic, collecting information that's transmitted through the device, and disabling devices entirely.
The devices affected include Linksys, MicroTik, Netgear, and TP-Link. The malware attack is being linked to Russia.
We strongly recommend that all businesses, no matter how small, always use a business-class firewall.
For additional information, we recommend excellent summaries in The NY Times and Krebs on Security (a lot more technical detail).