A race condition was addressed with additional validation. This issue affected versions prior to iOS 11.2, macOS High Sierra 10.13.2, tvOS 11.2, watchOS 4.2, iTunes 12.7.2 for Windows, macOS High Sierra 10.13.4.
https://support.apple.com/kb/HT208325
https://support.apple.com/kb/HT208326
https://support.apple.com/kb/HT208327
https://support.apple.com/kb/HT208331
Source: MITRE
Published: 2019-04-03
Updated: 2019-04-05
Type: CWE-362
Base Score: 5.1
Vector: AV:N/AC:H/Au:N/C:P/I:P/A:P
Impact Score: 6.4
Exploitability Score: 4.9
Severity: MEDIUM
Base Score: 7
Vector: CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 1
Severity: HIGH