Apple has released an emergency update to patch a serious vulnerability (https://support.apple.com/en-us/HT212258) found in iOS, iPadOS, and watchOS. The patches are iOS 14.4.2, iPadOS 14.4.2, and watchOS 7.3.3, respectively.
Current versions of Apple products use the updated version of Bonjour. For previous versions, Apple has issued a security update. Apple has issued a security update for mDNSResponder, the low-level open source software that implements Bonjour in Apple and third-party products. Which Apple platforms are affected?OS X:  Versions prior to OS X El Capitan v10.11.1  Versions prior to OS X Yosemite v10.10.5 with Security Update 2015-004 Yosemite  Versions prior to OS X Mavericks v10.9.5 with Security Update 2015-007 Mavericks  iOS versions prior to iOS 9.1  watchOS versions prior to watchOS 2.1  AirPort Base Station Firmware versions prior to 7.7.7 and...