In iOS before 11.2, exchange rates were retrieved from HTTP rather than HTTPS. This was addressed by enabling HTTPS for exchange rates.
https://support.apple.com/HT208334
Source: Mitre, NVD
Published: 2019-01-11
Updated: 2019-01-17
Base Score: 4.3
Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:N/A:N
Severity: Medium
Base Score: 5.9
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N