A buffer overflow issue was addressed with improved memory handling. This issue is fixed in macOS Monterey 12.1, watchOS 8.3, iOS 15.2 and iPadOS 15.2, tvOS 15.2. An attacker in a privileged network position may be able to execute arbitrary code.
https://support.apple.com/en-us/HT212980
https://support.apple.com/en-us/HT212978