Experts warn that attackers are exploiting a newly-disclosed security vulnerability present in countless networks and Web sites that rely on Unix and Linux operating systems. Experts say the flaw, dubbed Shellshock, is so intertwined with the modern Internet that it could prove challenging to fix. The bug is being compared to the recent Heartbleed vulnerability because of its ubiquity and sheer potential for causing havoc on Internet-connected systems. The official patch for the security hole is incomplete and could still let attackers seize control over vulnerable systems.”]
Source: https://krebsonsecurity.com/2014/09/shellshock-bug-spells-trouble-for-web-security/