CVE Catalog

CVE-2021-34432

HighCVSS 7.5
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Elevated risk
1.25%

66th percentile - higher than 66% of all known CVEs

Summary

In Eclipse Mosquitto versions 2.0.7 and earlier, the server crashes if a client sends a PUBLISH packet with topic length = 0.

Risk Assessment

An attacker can intentionally send a PUBLISH packet with an empty topic, causing the server to crash and disrupting MQTT service.

Recommendation

Update Eclipse Mosquitto to version 2.0.8 or later, which includes a fix preventing the crash.

Related vulnerabilities

Original NVD description (English source)

In Eclipse Mosquitto versions 2.0.7 and earlier, the server will crash if the client tries to send a PUBLISH packet with topic length = 0.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS