Apple releases security updates for iOS 10.3, tvOS, watchOS, iOS, Pages, Numbers, Safari, and Keynote apps. APFS (APFS) is a 64-bit file system that comes to replace three-decades-old HFS+ file system. The new file system is optimized for flash and solid-state storage and was built with one thing in mind: speed. Apple also delivers fixes for iTunes and iTunes for Windows, iTunes for the Windows users. For a full list of vulnerabilities for each Apple product, you can consult the table.
Source: https://www.bleepingcomputer.com/news/apple/apple-releases-new-apfs-file-system-critical-security-updates/