Apple Releases iOS 12.5.5 Update for Older iPhones With Fix for Zero-Day Exploit
Apple today released an iOS 12.5.5 update for older iPhones and iPads that are not able to run the current version of iOS, iOS 15.

The update can be downloaded over-the-air by going to the Settings app, tapping on "General," and selecting the "Software Update" option.
There's no word yet on what's included in the iOS 12.5.5 update, but according to Apple's release notes, it is a security update that addresses vulnerabilities with CoreGraphics, WebKit, and XNU. Apple says that it has received reports suggesting these exploits were used in the wild, so iOS device users still running iOS 12 should update immediately.
According to Bleeping Computer, at least one of the bugs was likely used to deploy NSO Pegasus spyware on hacked devices.
Devices unable to be updated past iOS 12 include the iPhone 5s, iPhone 6, iPhone 6 Plus, iPod touch 6, original iPad Air, iPad mini 2, and iPad mini 3.
Update: Apple has also released a new 2021-006 Security Update for machines running macOS Catalina.
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