Dave Farrington responding the headline:
Just one day after its release, iOS 11.1
There’s more to the story.
Vulnerabilities exist in every operating system; Windows, Linux, iOS, Android, macOS, et al. Exploits exist for many of those vulnerabilities (but not all), but most of those exploits require physical access to your device, or require your device to be connected to an affected network, or require your device to visit a specific website, or use a specific application, or download and install a file, etc., ad nauseam.
In other words, don’t worry, the sky is not falling.