This isn't a day at the beach, oh no. This is a software bug that has been sweeping the nation, but is it as dangerous as Heartbleed? In short, yes it's extremely dangerous for those in the know. Shellshock, otherwise known as Bashdoor, is part of a group of security bugs in Unix shell 'Bash'. Bash is basically free software that is used on millions operating systems such as Linux and Mac OS X, but can also be found ported to Microsoft Windows and Android devices.