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Mac EFI Security Update 2015-002

Apple has released Mac EFI Security Update 2015-002 for OS X 10.9.5 Mavericks, which addresses an issue where the EFI (Extensible Firmware Interface) could potentially be overwritten without authorization. This update is available as a direct download as well as via Software Update. (Free, 82 MB, 10.9.5)

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