 A global technical failure caused flights to stop, banks to stop, and the media to stop broadcasting. This large-scale interruption has affected companies and services all over the world, and has highlighted the dependence on the software of a small number of suppliers. Network security company Crosstrek said that the reason for the crash is not a security incident or a network attack, but that the Windows computer has deployed a defective update. A few hours after the first discovery of the problem, the chaos continues.