There has never been a successful, widespread malware attack against iPhone. The only system-level iOS attacks we observe in the wild come from mercenary spyware, which is vastly more complex than regular cybercriminal activity and consumer malware. Mercenary spyware is historically associated with state actors and uses exploit chains that cost millions of dollars to target a very small number of specific individuals and their devices. [...] Known mercenary spyware chains used against iOS share a common denominator with those targeting Windows and Android: they exploit memory safety vulnerabilities, which are interchangeable, powerful, and exist throughout the industry.
— Apple Security Engineering and Architecture, introducing Memory Integrity Enforcement for iPhone 17
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