CVE-2023-39946

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    CVE-2023-39946

    Published: 11 Aug 2023Last Modified: 12 Aug 2026

    Summary: Heap overflow in push_back_helper due to a CDR message

    Details: eprosima Fast DDS is a C++ implementation of the Data Distribution Service standard of the Object Management Group. Prior to versions 2.11.1, 2.10.2, 2.9.2, and 2.6.6, heap can be overflowed by providing a PID_PROPERTY_LIST parameter that contains a CDR string with length larger than the size of actual content. In `eprosima::fastdds::dds::ParameterPropertyList_t::push_back_helper`, `memcpy` is called to first copy the octet'ized length and then to copy the data into `properties_.data`. At the second memcpy, both `data` and `size` can be controlled by anyone that sends the CDR string to the discovery multicast port. This can remotely crash any Fast-DDS process. Versions 2.11.1, 2.10.2, 2.9.2, and 2.6.6 contain a patch for this issue.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/39xxx/CVE-2023-39946.json, https://github.com/eProsima/Fast-DDS/security/advisories/GHSA-j297-rg6j-m7hx, https://nvd.nist.gov/vuln/detail/CVE-2023-39946, https://www.debian.org/security/2023/dsa-5481, https://github.com/eProsima/Fast-DDS/commit/349227005827e8a67a0406b823138b5068cc47dc

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 7124ff87c4813bed26858fd89d3b915a5857dbc7
    Fixed -cffaa679ec8cd9c84b4d5b3fe1e3c22974d63be0

    Affected versions

    2.11.0

    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
    CVE-2023-39946 | CVE-DB