Shellshock, also known as
Bashdoor, is a family of
security bugs in the widely used
Unix Bash shell, the first of which was disclosed on 24 September 2014. Many Internet-facing services, such as some web server deployments, use Bash to process certain requests, allowing an attacker to cause vulnerable versions of Bash to
execute arbitrary commands. This can allow an attacker to gain unauthorized access to a computer system.