MacOS Big Sur 11.5.1 Update Released with Security Fix
Apple has released MacOS Big Sur 11.5.1 update for Mac users running Big Sur. The update “provides important security updates” for an apparently actively exploited issue, and is therefore recommended by Apple to install for all eligible Mac users.
Despite being a single security update, the download for Macs is nearly 3GB.
Separately, Apple released iOS 14.7.1 and iPadOS 14.7.1 for iPhone and iPad, respectively, with what appears to be the same security fix.