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Fencer Vulns
medium 6.5

CVE-2019-11779 json

In Eclipse Mosquitto 1.5.0 to 1.6.5 inclusive, if a malicious MQTT client sends a SUBSCRIBE packet containing a topic that consists of appr…

published 2019-09-19 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-3446

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.7%
EPSS 2.7% chance of exploitation in 30 days, percentile 86%
public exploits
0
none known

Summary

In Eclipse Mosquitto 1.5.0 to 1.6.5 inclusive, if a malicious MQTT client sends a SUBSCRIBE packet containing a topic that consists of approximately 65400 or more '/' characters, i.e. the topic hierarchy separator, then a stack overflow will occur.

Patch / fix

  • eclipse mosquitto 1.5.9, 1.6.6
  • mosquitto Debian 14, Debian 13, Debian 12 1.6.6-1

debian advisories DEBIAN-CVE-2019-11779

  • mosquitto Package Hub 15 SP1 1.5.7-bp151.3.3.1
  • mosquitto openSUSE Leap 15.1 1.5.7-lp151.2.3.1

opensuse advisories openSUSE-SU-2019:2247-1openSUSE-SU-2019:2206-1

  • mosquitto Alpine 3.10 1.6.3-r1
  • mosquitto Alpine 3.24, Alpine 3.23, Alpine 3.22 +11 more 1.6.7-r0
  • mosquitto Alpine 3.9 1.5.6-r1

alpine advisories ALPINE-CVE-2019-11779

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-2019-11779 updated cvss 6.5

mosquitto: malicious MQTT sends SUBSCRIBE packet leads to stack over flow

  • 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

2.74% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:N/I:N/A:P

Affected products

  • The Eclipse Foundation Eclipse Mosquitto

Classification

Weakness
  • CWE-754 Improper Check for Unusual or Exceptional Conditions
  • CWE-674 Uncontrolled Recursion

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.