About Apple security updates
For our customers' protection, Apple doesn't disclose, discuss, or confirm security issues until an investigation has occurred and patches or releases are available. Recent releases are listed on the Apple security updates page.
Apple security documents reference vulnerabilities by CVE-ID when possible.
For more information about security, see the Apple Product Security page.
Released December 10, 2019
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: natashenka of Google Project Zero