A slimy piece of malware called the moon worm has managed to slither past the login for Linksys E-series routers. SANS ISC said that it's the CGI script for the administration interface that's vulnerable, and recommends that you upgrade your firmware--when an upgrade that fixes the problem is made available. As of now, you're invited to switch off your E-series router's Remote Management Console to avoid possible hacking. If you never turned it on, you're in luck, it's disabled by default.
Bugs & Fixes: The Moon Worm slinks by Linksys E-series routers
There's no real fix for this malware yet, but you can thwart it by keeping a specific setting disabled.