CVE-2021-34431

moderate-risk

Published 2021-07-22

In Eclipse Mosquitto version 1.6 to 2.0.10, if an authenticated client that had connected with MQTT v5 sent a crafted CONNECT message to the broker a memory leak would occur, which could be used to provide a DoS attack against the broker.

Do I need to act?

0.37% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 6.5/10 Medium

NETWORK / LOW complexity

Affected Products (1)

Mosquitto

Affected Vendors

Eclipse

References (2)

Mailing List https://bugs.eclipse.org/bugs/show_bug.cgi?id=573191

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moderate-risk

Severity 24/34 · High

Exploitability 1/34 · Minimal

Exposure 5/34 · Minimal