https://wccftech.com/install-ios-11-1-asap-fixes-krack/

Apple released iOS 11.1 to iPhone, iPad and iPod touch yesterday. While the release may have focused on bringing 70 new emojis to users, it also fixes some critical security flaws, notably the KRACK Wi-Fi vulnerability. The flaw had already been fixed by Google and Microsoft and now the Cupertino iPhone maker has also released a patch for this vulnerability.

Along with KRACK, Apple has fixed a number of other critical security flaws, including: