Apple releases macOS Excessive Sierra 10.13.three and iOS 11.2.5

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The macOS High Sierra 10.13.3 Update improves the stability and security of your Mac and is recommended for all users.

On January 23, 2018, Apple released a third set of updates for macOS that backported previous Meltdown patches to older versions of the macOS operating system.

These updates backported the company's Meltdown patch, originally released in December 2017.

The move brings Apple closer to being on par with Microsoft in terms of deploying protections for older versions of its desktop operating systems. As CNET spotted, Apple posted about the security updates on its support site. The new developer beta comes one day after the release of macOS 10.13.3 which includes security improvements and a fix for Messages bugs.

Many users have criticized Apple for releasing Meltdown and Spectre patches only for recent OS versions. The updates are dubbed Security Update 2018-001.

If you're running an even older version of macOS then you're out of luck: you'll need to upgrade to a newer macOS, or fork out for a new Mac machine that has the guts to power the more up-to-date version of macOS - or you can just keep your fingers crossed and hope for the best. Alternatively, it can also be updated through iTunes.

Spectre and Meltdown are both hardware-side vulnerabilities that affect basically all computers with modern processors.

Because the exploits take advantage of design decisions meant to make CPUs faster, it's worth noting that introducing fixes for Meltdown and could slow down a computer. Windows 10 is already patched, several versions of Linux are patched but Apple has been lagging behind a bit.

Similarly, the Spectre patch for Safari seems to have had little to no impact on the web browser's performance across operating systems.

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