In Moodle 3.x, the setting for blocked hosts list can be bypassed with multiple A record hostnames.
https://moodle.org/mod/forum/discuss.php?d=364382
http://www.securityfocus.com/bid/102769
Source: Mitre, NVD
Published: 2018-01-22
Updated: 2019-10-03
Base Score: 4
Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:P/A:N
Severity: Medium
Base Score: 6.5
Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N