CVE-2021-37740

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    CVE-2021-37740

    Published: 20 Apr 2022Last Modified: 10 Mar 2026

    Summary:

    Details: A denial of service vulnerability exists in MDT's firmware for the KNXnet/IP Secure router SCN-IP100.03 and KNX IP interface SCN-IP000.03 before v3.0.4, that allows a remote attacker to turn the device unresponsive to all requests on the KNXnet/IP Secure layer, until the device is rebooted, via a SESSION_REQUEST frame with a modified total length field.

    References: https://www.mdt.de/EN_IP_Interface_Router.html, , https://www.mdt.de/download/MDT_CL_SCN_IP_03_IP_Interface_Router.pdf, https://github.com/robertguetzkow/CVE-2021-37740

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    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