Security experts at Binamuse firm have published a complete PoC on their website confirming that a demo will be soon available. The vulnerability resides in the CoreGraphics framework which fails to correctly parse the PDF files. Apple has immediately confirmed the presence of the flaw and the efficiency of the exploit only for the Apple TV version below 7.1.x. The company published on the support page of Apple TV 7 a post on the security issued and urged users to upgrade to latest version of the operating system as soon as possible.”]
Source: https://securityaffairs.co/wordpress/28561/hacking/ios-7_1-exploit-cve-2014-4377.html