A use after free issue was addressed with improved memory management. This issue is fixed in iOS 12.4, tvOS 12.4, watchOS 5.3. A remote attacker may be able to cause arbitrary code execution.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8647
Reference (s):
- https://support.apple.com/HT210346
- https://support.apple.com/HT210351
- https://support.apple.com/HT210353