UBUNTU-CVE-2021-34431

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    UBUNTU-CVE-2021-34431

    Published: 22 Jul 2021Last Modified: 22 Apr 2026
    Upstream:
    CVE-2021-34431
    Aliases:
    USN-6492-1

    Summary:

    Details: 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.

    References: https://ubuntu.com/security/CVE-2021-34431, https://bugs.eclipse.org/bugs/show_bug.cgi?id=573191, https://ubuntu.com/security/notices/USN-6492-1, https://www.cve.org/CVERecord?id=CVE-2021-34431

    Affected packages

    Package

    Name: mosquitto

    Purl: pkg:deb/ubuntu/[email protected]~esm1?arch=source&distro=esm-apps/focal

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1.6.9-1ubuntu0.1~esm1

    Affected versions

    1.6.6-1
    1.6.7-1
    1.6.8-1
    1.6.8-2
    1.6.9-1~build1
    1.6.9-1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2021-34431 | CVE-DB