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Fencer Vulns
high 8.1

CVE-2018-12550 json

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 comm…

published 2019-03-27 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-4510

cvss
8.1
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 71%
public exploits
0
none known

Summary

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.

Patch / fix

  • mosquitto Debian 14, Debian 13, Debian 12 1.5.6-1

debian advisories DEBIAN-CVE-2018-12550

  • mosquitto Ubuntu 16.04 LTS 1.4.8-1ubuntu0.16.04.5
  • mosquitto Ubuntu 18.04 LTS 1.4.15-2ubuntu0.18.04.1

ubuntu advisories UBUNTU-CVE-2018-12550

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • mosquitto Package Hub 15 1.4.15-bp150.3.3.1

opensuse advisories openSUSE-SU-2019:0237-1

  • mosquitto Alpine 3.24, Alpine 3.23, Alpine 3.22 +13 more 1.5.6-r0
  • mosquitto Alpine 3.7 1.4.15-r1
  • mosquitto Alpine 3.8 1.4.15-r4

alpine advisories ALPINE-CVE-2018-12550

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-12550 updated cvss 5.7

mosquitto: improper access control in ACL file leads to use default allow policy

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.35% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 8.1 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • The Eclipse Foundation Eclipse Mosquitto

Classification

Weakness
  • CWE-440 Expected Behavior Violation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.