Most people buy a router, install it, and never touch it again. But they run software like any computer and that software can have bugs and vulnerabilities. Upgrading a router is usually a trivial matter and most manufacturer websites have detailed instructions for doing so. Always make sure you follow the direction to identify your model and hardware version to select the right download. Then login to your router and follow the instructions for upgrading (often under an 'Admin' or 'Tools' tab). Be sure to backup your router settings before updating as some routers can 'reset' your settings after an upgrade. Just load the configuration back in.

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12 million home and business routers vulnerable to critical hijacking hack
Bug exposes user data, as well as computers, Web cams, and other connected devices.