Apple Security Advisory 2017-12-13-2 - tvOS 11.2.1 is now available and addresses a message handling issue.
7f9e5c3e828472f9841f37d184486ebabdbf5e4b308b5da723ce623c5ecd7f22
Apple Security Advisory 2017-12-13-1 - iOS 11.2.1 is now available and addresses a message handling issue.
9f70803c117fb99f70f2c54098d2a54f3557550c20837d8407e7fb123ad88f57