CVE-2017-7653 Denial of service in Eclipse Mosquitto

What is CVE-2017-7653?

CVE-2017-7653 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 5 Jun 2018. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

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.

Weakness: CWE-20

Which versions are affected by CVE-2017-7653?

It affects 2 products.

Products include Debian Debian Linux, Eclipse Mosquitto.

How do I fix CVE-2017-7653?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2017-7653 being exploited?

There is no known exploitation of CVE-2017-7653 in the wild and no public exploit code.

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• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2017-7653, GHSA-9xf7-gm92-xr5m, UBUNTU-CVE-2017-7653.