What is CVE-2017-9868?

CVE-2017-9868 is a medium-severity vulnerability in Eclipse Mosquitto, classified under Information Disclosure. CVSS score: 5.5/10. Published 2017-06-25.

How severe is CVE-2017-9868?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Information disclosure in Eclipse Mosquitto

CVE-2017-9868

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.

Vulnerability class: Information Disclosure

Published 2017-06-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (27.8th percentile), scored 2026-10-07.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 27.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Eclipse Mosquitto
Debian Linux — versions 8.0

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

github.com/eclipse/mosquitto/issues/468 (Patch, Third Party Advisory, Issue Tracking)
lists.debian.org/debian-lts-announce/2018/09/msg00036.html (mailing-list, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2017-9868?: CVE-2017-9868 is a medium-severity vulnerability in Eclipse Mosquitto, classified under Information Disclosure. CVSS score: 5.5/10. Published 2017-06-25.
How severe is CVE-2017-9868?: Medium severity. CVSS v3 base score is 5.5 out of 10.