What’s Vulnerable › Vulnerabilities

CVE-2021-28166

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-04-07 · updated 2026-06-17
• Weakness: CWE-476

Description

In Eclipse Mosquitto version 2.0.0 to 2.0.9, if an authenticated client that had connected with MQTT v5 sent a crafted CONNACK message to the broker, a NULL pointer dereference would occur.

Affected products

• The Eclipse Foundation Eclipse Mosquitto: from 2.0.0 through 2.0.9

References

• https://bugs.eclipse.org/bugs/show_bug.cgi?id=572608
• https://bugs.eclipse.org/bugs/show_bug.cgi?id=572608

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