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Breaking the silence over potential security flaws in chips, Apple has admitted that all Mac systems and iOS devices are affected but are safe at the moment. Security researchers have uncovered security issues in chips known as "Meltdown" and "Spectre". "These issues apply to all modern processors and affect nearly all computing devices and operating systems. All Mac systems and iOS devices are affected but there are no known exploits impacting customers at this time," Apple said in a blog post late on Thursday.