https://hothardware.com/news/apple-admits-only-fully-patches-security-flaws-in-latest-os-releases
Apple Admits It Only Fully Patches Security Flaws In Its Latest OS Releases
Apple loves to tout that they are a leader in security for personal
computing devices.
The company even claimed that "Macs don't have that problem," when
referring to viruses in the Mac vs. PC ads of 2006 through 2009 starring
Justin Long and John Hodgman.
This obviously is not true, and Apple got in legal hot water for the claim.
According to a document published by Apple and found by our colleagues over
at Arstechnica, security researchers' fears have rang true. Old versions of operating systems of Apple devices do not get complete security patches.
https://arstechnica.com/gadgets/2022/10/apple-clarifies-security-update-policy-only-the-latest-oses-are-fully-patched/
Only the latest OSes are fully patched
The emphasis in the document is that there is a difference between Upgrade
and Update, at least in the Apple lexicon.
https://support.apple.com/guide/deployment/about-software-updates-depc4c80847a/web
To Apple, an Upgrade would be a single major version number. For example,
going from iOS 15 to iOS 16, or macOS 12 to macOS 13 are upgrades, while anything with a decimal after it is an update.
If consumers want the latest security they are going to have to buy the
devices that support the latest operating systems.
That actually shortens actual long-term security life-cycle for some Apple devices, because if the device does not support that latest upgrade, it
might not get that latest update.
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