All said, there are a whopping 21 security updates in 11.6.1, a
few of which appear to be quite serious. Several of them say the
vulnerability could lead to arbitrary code execution and at least
one has been actively exploited, meaning some users' machines have
been affected. Among the security updates are fixes for
AppleScript, Audio, CoreGraphics, iCloud, Kernel, and Software
Update itself. Apple acknowledged Ryan Pickren for his assistance
with spotting the iCloud bug, in which A local attacker may be able
to elevate their privileges.
Apple has also pushed the same security updates to iPhones and
iPads in iOS 14.8.1 and iOS 15.1 and the first macOS 12.0.1 Monterey release.
To download the update, head over to System Preferences, click
on Software Update, and select the Big Sur update. If you see
Monterey in the window, click the More infoâ€¦ button to bypass the
upgrade and see the latest update to Big Sur. Then click Install