CVE-2017-7650

Severity: medium (CVSS 6.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2017-09-11 · updated 2026-06-17
Weakness: CWE-287

Description

In Mosquitto before 1.4.12, pattern based ACLs can be bypassed by clients that set their username/client id to '#' or '+'. This allows locally or remotely connected clients to access MQTT topics that they do have the rights to. The same issue may be present in third party authentication/access control plugins for Mosquitto.

Affected products

Debian Linux: 8.0
The Eclipse Foundation Eclipse Mosquitto: before 1.4.12 — fixed in 1.4.12

How to fix

Upgrade to a fixed version: The Eclipse Foundation Eclipse Mosquitto 1.4.12. Check the vendor advisory for mitigations.

References

http://mosquitto.org/2017/05/security-advisory-cve-2017-7650/
http://www.debian.org/security/2017/dsa-3865
http://www.securityfocus.com/bid/98741
https://bugs.eclipse.org/bugs/show_bug.cgi?id=516765
http://mosquitto.org/2017/05/security-advisory-cve-2017-7650/
http://www.debian.org/security/2017/dsa-3865
http://www.securityfocus.com/bid/98741
https://bugs.eclipse.org/bugs/show_bug.cgi?id=516765

Get alerted when CVE-2017-7650 or the next vulnerability affects your stack