A use after free issue was addressed with improved memory management. This issue is fixed in tvOS 13.3, iCloud for Windows 10.9, iOS 13.3 and iPadOS 13.3, Safari 13.0.4, iTunes 12.10.3 for Windows, iCloud for Windows 7.16. Processing maliciously crafted web content may lead to arbitrary code execution.
https://support.apple.com/en-us/HT210795
https://support.apple.com/en-us/HT210794
https://support.apple.com/en-us/HT210793
https://support.apple.com/en-us/HT210792