A use after free issue was addressed with improved memory management. This issue is fixed in watchOS 7.0, iOS 14.0 and iPadOS 14.0, iTunes for Windows 12.10.9, iCloud for Windows 11.5, tvOS 14.0, Safari 14.0. Processing maliciously crafted web content may lead to arbitrary code execution.
https://support.apple.com/en-us/HT211952
https://support.apple.com/en-us/HT211935
https://support.apple.com/en-us/HT211850
https://support.apple.com/en-us/HT211845
https://support.apple.com/en-us/HT211844
https://support.apple.com/en-us/HT211843