What’s Vulnerable › Vulnerabilities

CVE-2018-20145

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-12-13 · updated 2026-06-17
• Weakness: CWE-732

Description

Eclipse Mosquitto 1.5.x before 1.5.5 allows ACL bypass: if the option per_listener_settings was set to true, and the default listener was in use, and the default listener specified an acl_file, then the acl file was being ignored.

Affected products

• The Eclipse Foundation Eclipse Mosquitto: from 1.5 before 1.5.5 — fixed in 1.5.5

How to fix

Upgrade to a fixed version: The Eclipse Foundation Eclipse Mosquitto 1.5.5. Check the vendor advisory for mitigations.

References

• https://github.com/eclipse/mosquitto/blob/master/ChangeLog.txt
• https://github.com/eclipse/mosquitto/commit/9097577b49b7fdcf45d30975976dd93808ccc0c4
• https://github.com/eclipse/mosquitto/issues/1073
• https://github.com/eclipse/mosquitto/blob/master/ChangeLog.txt
• https://github.com/eclipse/mosquitto/commit/9097577b49b7fdcf45d30975976dd93808ccc0c4
• https://github.com/eclipse/mosquitto/issues/1073

Get alerted when CVE-2018-20145 or the next vulnerability affects your stack