Apple has issued four updates for Safari, OS X Mavericks, Apple TV and iOS because of 38 vulnerabilities published in NISTs National Vulnerability Database. One of the vulnerabilities scored Security Databases highest rank in terms of complexity while 16 were of medium rank and 21 were of the lowest rank. The most severe were located in the iOS and OS X graphic drivers, most of them affecting the WebKit and allowing attackers to execute code or crash certain applications. The lowest severity score, of 1.9, was given to an iOS lock-screen vulnerability.”]