Enlarge (credit: Apple)

Today, Apple released iOS 11.1 and macOS High Sierra 10.13.1, which bring a notable security update, bug fixes, and a handful of other changes to modern iPhones, iPads, iPods, and Macs.

Critically, both software updates address the KRACK Wi-Fi vulnerability for some devices. It is a serious vulnerability in the WPA2 Wi-Fi security standard that allowed hostile actors to perform a key reinstallation and listen to Wi-Fi traffic for passwords and other personal data, among other things.

Update: As Ars readers have pointed out, Apple’s support documentation states that the iOS KRACK fix is available for iPhone 7 and later, and for the early 2016, 9.7-inch iPad Pro and later. That could leave many iOS devices still exposed.

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