Multiple memory corruption issues were addressed with improved memory handling. This issue is fixed in iOS 13, iCloud for Windows 7.14, iCloud for Windows 10.7, Safari 13, tvOS 13, watchOS 6, iTunes 12.10.1 for Windows. Processing maliciously crafted web content may lead to arbitrary code execution.
https://support.apple.com/en-us/HT210637
https://support.apple.com/en-us/HT210636
https://support.apple.com/en-us/HT210635
https://support.apple.com/en-us/HT210608
https://support.apple.com/en-us/HT210607