An issue was discovered in certain Apple products. iOS before 11.3 is affected. Safari before 11.1 is affected. iCloud before 7.4 on Windows is affected. iTunes before 12.7.4 on Windows is affected. tvOS before 11.3 is affected. watchOS before 4.3 is affected. The issue involves the "WebKit" component. It allows attackers to cause a denial of service (memory corruption) via a crafted web site.
https://usn.ubuntu.com/3635-1/
https://support.apple.com/HT208698
https://support.apple.com/HT208697
https://support.apple.com/HT208696
https://support.apple.com/HT208695
https://support.apple.com/HT208694
https://support.apple.com/HT208693