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CVE-2021-34431

Published: 22 July 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.

Priority

Medium

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package Release Status
mosquitto
Launchpad, Ubuntu, Debian
groovy Ignored
(end of life)
hirsute Ignored
(end of life)
kinetic Ignored
(end of life, was needs-triage)
impish Ignored
(end of life)
bionic Not vulnerable
(code not present)
focal
Released (1.6.9-1ubuntu0.1~esm1)
Available with Ubuntu Pro
jammy Not vulnerable
(2.0.11-1ubuntu1)
lunar Not vulnerable
(2.0.11-1.2)
mantic Not vulnerable
(2.0.18-1)
trusty Not vulnerable
(code not present)
upstream
Released (2.0.11)
xenial Not vulnerable
(code not present)
Patches:
upstream: https://github.com/eclipse/mosquitto/commit/42163634c72d41a1f12d299f54e00adf14520eb2

Severity score breakdown

Parameter Value
Base score 6.5
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H