What’s Vulnerable › Vulnerabilities

CVE-2023-0809

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-10-02 · updated 2026-06-17
• Weakness: CWE-789

Description

In Mosquitto before 2.0.16, excessive memory is allocated based on malicious initial packets that are not CONNECT packets.

Affected products

• The Eclipse Foundation Eclipse Mosquitto: before 2.0.16 — fixed in 2.0.16

How to fix

Upgrade to a fixed version: The Eclipse Foundation Eclipse Mosquitto 2.0.16. Check the vendor advisory for mitigations.

References

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

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