An issue was discovered in certain Apple products. iOS before 10.1 is affected. macOS before 10.12.1 is affected. tvOS before 10.0.1 is affected. watchOS before 3.1 is affected. watchOS before 3.1.3 is affected. The issue involves the "FontParser" component. It allows remote attackers to execute arbitrary code or cause a denial of service (buffer overflow and application crash) via a crafted font.
https://support.apple.com/HT207487
https://support.apple.com/HT207275
https://support.apple.com/HT207271
https://support.apple.com/HT207270
https://support.apple.com/HT207269