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About the security content of iOS 15.4.1 and iPadOS 15.4.1 - Apple Support
https://support.apple.com/en-us/HT213219
https://support.apple.com/en-us/HT213220
Apple emergency update fixes zero-days used to hack iPhones, Macs
https://www.bleepingcomputer.com/news/security/apple-emergency-update-fixes-zero-days-used-to-hack-iphones-macs/
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