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Fencer Vulns
high 7.5

CVE-2018-12543 in the critical feed json

In Eclipse Mosquitto versions 1.5 to 1.5.2 inclusive, if a message is published to Mosquitto that has a topic starting with $, but that is…

published 2018-11-15 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-4505

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
36.0%
EPSS 36.0% chance of exploitation in 30 days, percentile 98%
public exploits
0
none known

Summary

In Eclipse Mosquitto versions 1.5 to 1.5.2 inclusive, if a message is published to Mosquitto that has a topic starting with $, but that is not $SYS, e.g. $test/test, then an assert is triggered that should otherwise not be reachable and Mosquitto will exit.

Patch / fix

  • mosquitto Alpine 3.24, Alpine 3.23, Alpine 3.22 +13 more 1.5.3-r0

alpine advisories ALPINE-CVE-2018-12543

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

  • mosquitto Arch Linux 1.5.3-1

arch linux advisories AVG-772

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-2018-12543 updated cvss 4.0

mosquitto: DoS due to a reachable assertion in topic field

  • 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

36.01% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • The Eclipse Foundation Eclipse Mosquitto

Classification

Weakness

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.