On Monday, I released an alert related to iOS 11. Yesterday, Apple released an update to address the specific issue noted in my alert. iOS 11.0.1 is now available and should be installed. If you don’t see the prompt to install it, simply go into Settings, then General and then Software Update and it will show as available for installation.
Another concern with the High Sierra update is that it introduces a new file system for the first time in decades. The concern here is that this will prevent you from reverting to a prior install once you make the update. There are also reports that some 3rd party applications are not compatible with the new OS update.
I’m sure Apple will release an update, specifically to address the Zero Day Vulnerability. In the meantime, play it safe and don’t upgrade until they do.