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Fencer Intel
medium 5.3

CVE-2017-7653 json

The Eclipse Mosquitto broker up to version 1.4.15 does not reject strings that are not valid UTF-8.

published 2018-06-05 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-16658

cvss
5.3
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 73%
public exploits
0
none known

Summary

The Eclipse Mosquitto broker up to version 1.4.15 does not reject strings that are not valid UTF-8. A malicious client could cause other clients that do reject invalid UTF-8 strings to disconnect themselves from the broker by sending a topic string which is not valid UTF-8, and so cause a denial of service for the clients.

Patch / fix

  • mosquitto Debian 14, Debian 13, Debian 12 1.5.4-1

debian advisories DEBIAN-CVE-2017-7653

  • mosquitto Ubuntu 16.04 LTS 1.4.8-1ubuntu0.16.04.7
  • mosquitto Ubuntu 18.04 LTS 1.4.15-2ubuntu0.18.04.3

ubuntu advisories UBUNTU-CVE-2017-7653

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

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-2017-7653 updated cvss 3.1

mosquitto: Improper handling of UTF-8 strings allows malicious clients to cause other clients to disconnect

  • 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

1.44% chance of exploitation in the next 30 days, higher than 73% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 5.3 CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 3.5 AV:N/AC:M/Au:S/C:N/I:N/A:P

Affected products

  • The Eclipse Foundation Eclipse Mosquitto

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Intel 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.