A logic issue existed in the handling of answering phone calls. The issue was addressed with improved state management. This issue is fixed in iOS 12.4. The initiator of a phone call may be able to cause the recipient to answer a simultaneous Walkie-Talkie connection.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8699
Reference (s):
- https://support.apple.com/HT210346