CVE-2021-34431 in Eclipse and Canonical Products
Published on July 22, 2021

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.

NVD

Weakness Type

What is a Memory Leak Vulnerability?

The software does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. This is often triggered by improper handling of malformed data or unexpectedly interrupted sessions. In some languages, developers are responsible for tracking memory allocation and releasing the memory. If there are no more pointers or references to the memory, then it can no longer be tracked and identified for release.

CVE-2021-34431 has been classified to as a Memory Leak vulnerability or weakness.

Products Associated with CVE-2021-34431

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Eclipse Mosquitto

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Canonical Ubuntu Linux

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Affected Versions

• Version 1.6 and below unspecified is affected.
• Version unspecified, <= 2.0.10 is affected.

Exploit Probability