CVE-2023-28366

Publication date 1 September 2023

Last updated 27 June 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

Description

The broker in Eclipse Mosquitto 1.3.2 through 2.x before 2.0.16 has a memory leak that can be abused remotely when a client sends many QoS 2 messages with duplicate message IDs, and fails to respond to PUBREC commands. This occurs because of mishandling of EAGAIN from the libc send function.

Read the notes from the security team

Status

Package Ubuntu Release Status
mosquitto 23.10 mantic
Not affected
23.04 lunar
Fixed 2.0.11-1.2ubuntu0.1
22.04 LTS jammy
Fixed 2.0.11-1ubuntu1.1
20.04 LTS focal Ignored backporting risks regressions
18.04 LTS bionic Ignored backporting risks regressions
16.04 LTS xenial Ignored backporting risks regressions
14.04 LTS trusty
Not affected

Notes

gianz

Memory leak requiring refactoring of core functions to be fixed. Applying the patches to versions < 2.0.0 is likely to cause regressions.

Severity score breakdown

Parameter Value
Base score 7.5 · High
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

References

Related Ubuntu Security Notices (USN)

    • USN-6492-1
    • Mosquitto vulnerabilities
    • 21 November 2023

Other references