About the security content of watchOS 5.3.4 - Apple Support

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watchOS 5.3.4

Released December 10, 2019

FaceTime

Available for: Apple Watch Series 1, Apple Watch Series 2, Apple Watch Series 3, and Apple Watch Series 4 when paired to a device with iOS 12 installed

Impact: Processing malicious video via FaceTime may lead to arbitrary code execution

Description: An out-of-bounds read was addressed with improved input validation.

CVE-2019-8830: Natalie Silvanovich of Google Project Zero