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CVE-2021-34432

Published: 27 July 2021

In Eclipse Mosquitto versions 2.07 and earlier, the server will crash if the client tries to send a PUBLISH packet with topic length = 0.

Notes

AuthorNote
gianz
PoC: https://bugs.eclipse.org/bugs/show_bug.cgi?id=574141 (first message)
The CVE indicates versions <= 2.0.7 as affected.
However only versions >= 2.0.0 and <= 2.0.7 are vulnerable.
No crash detected running the PoC against any previous version we support.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
mosquitto
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
focal Not vulnerable
(code not present)
hirsute Not vulnerable
(2.0.10-3)
impish Not vulnerable

jammy Not vulnerable
(2.0.11-1ubuntu1)
kinetic Not vulnerable

lunar Not vulnerable
(2.0.11-1.2)
mantic Not vulnerable
(2.0.18-1)
trusty Not vulnerable
(code not present)
upstream
Released (2.0.8-1)
xenial Not vulnerable
(code not present)

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H