To those that run your own webservers, and Mac OSX users.. If you haven’t already heard, there is a critical exploit out called SHELLSHOCK now that uses exploits a flaw in “bash” the primary command line of unix type operating systems. (linux, *bsd, Mac OSX). A variable can be used to execute a command.
This exploit can also be triggered remotely by making a special request to most webservers that run on linux or *bsd.