CVE-2018-12550

Severity: high (CVSS 8.1 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-03-27 · updated 2026-06-17
Weakness: CWE-440

Description

When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file, and that ACL file is empty, or contains only comments or blank lines, then Mosquitto will treat this as though no ACL file has been defined and use a default allow policy. The new behaviour is to have an empty ACL file mean that all access is denied, which is not a useful configuration but is not unexpected.

Affected products

The Eclipse Foundation Eclipse Mosquitto: from 1.0 through 1.5.5

References

https://bugs.eclipse.org/bugs/show_bug.cgi?id=541870
https://lists.debian.org/debian-lts-announce/2019/10/msg00035.html
https://bugs.eclipse.org/bugs/show_bug.cgi?id=541870
https://lists.debian.org/debian-lts-announce/2019/10/msg00035.html

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