An input validation issue was addressed with improved input validation. This issue is fixed in iOS 12.3, tvOS 12.3, watchOS 5.2.1. A malicious application may be able to gain root privileges.
https://support.apple.com/HT210122
https://support.apple.com/HT210120
https://support.apple.com/HT210118
Source: Mitre, NVD
Published: 2019-12-18
Updated: 2019-12-19
Base Score: 9.3
Vector: CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C
Severity: High
Base Score: 7.8
Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H