An out-of-bounds read was addressed with improved input validation. This issue is fixed in tvOS 13.3 watchOS 6.1.1 macOS Catalina 10.15.2 Security Update 2019-002 Mojave and Security Update 2019-007 High Sierra iOS 13.3 and iPadOS 13.3 iOS 12.4.4 watchOS 5.3.4. Processing malicious video via FaceTime may lead to arbitrary code execution.