An issue was discovered in certain Apple products. iOS before 10.3.3 is affected. macOS before 10.12.6 is affected. tvOS before 10.2.2 is affected. watchOS before 3.2.3 is affected. The issue involves the "Contacts" component. A buffer overflow allows remote attackers to execute arbitrary code or cause a denial of service (application crash).
https://support.apple.com/HT207925
https://support.apple.com/HT207924
https://support.apple.com/HT207923
https://support.apple.com/HT207922