Apple has released macOS Big Sur 11.2.3, iOS 14.4.1, iPadOS 14.4.1, watchOS 7.3.2.
MacOS Big Sur provides, per Apple’s release notes, “important security updates.” You can obtain macOS Big Sur 11.2.3 by going to System Preferences > Software Update.
iOS 14.4.1 and iPadOS 14.4.1 also provide important security updates.You can obtain iOS 14.4.1 and iPadOS 14.4.1 by going to System Preferences > Software Update on your iPhone or iPad.
watchOS 7.3.2 addresses a WebKit bug that could allow maliciously crafted web content to execute code. It can be download by going to the Apple Watch app on your iPhone and selecting General > Software Update. To install the operating system update, the Apple Watch battery needs to be at least 50%, be placed on a charger, and within range of your iPhone.