An API issue existed in the handling of microphone data. This issue was addressed with improved validation. This issue is fixed in iOS 12.2. A malicious application may be able to access the microphone without indication to the user.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8566
Reference (s):
- https://support.apple.com/HT209599