Apple has released a set of updates that recommends that all iPhone, iPad and Mac users download as soon as possible. No, iOS 14.5 and Big Sur 11.3 have not yet been released. Instead, what we have is macOS.
When you download them to your devices, all you get is a concise explanation from Apple that they are “important”. However, the support pages identified by 9to5Mac provide more information. Both updates address a memory corruption issue within WebKit, the engine that powers Apple’s Safari browser. The vulnerability, which was discovered by security researchers at Google and Microsoft, may have allowed malicious agents to run code on their devices using web content “created with malicious code”.
On iOS, you can manually download an update to your iPhone or iPad by opening the Settings app and tapping on “General” followed by “Software Update”. In the meantime, on macOS, open the System Preferences menu and click on “Software Update”.