In Mosquitto through 1.4.12, mosquitto.db (aka the persistence file) is world readable, which allows local users to obtain sensitive MQTT topic information.
https://lists.debian.org/debian-lts-announce/2018/09/msg00036.html
https://github.com/eclipse/mosquitto/issues/468
Source: Mitre, NVD
Published: 2017-06-25
Updated: 2019-03-12
Base Score: 2.1
Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:N/A:N
Severity: Low
Base Score: 5.5
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Severity: Medium