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    CVE-2023-28366

    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.

    Published:Sep 1, 2023
    Last Modified:Jun 26, 2025
    EPS:Sep 1, 2023
    EPSS Score:0.0009
    CVSS Score:7.5

    Affected Products

    Vendor
    Eclipse
    Product
    Mosquitto
    Vendor
    Redhat
    Product
    Satellite
    Vendor
    Redhat
    Product
    Satellite Capsule

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2024-3935 (CVSS 6) — In Eclipse Mosquito, versions from 2.0.0 through 2.0.18, if a Mosquitto broker is configured to create an outg…
    CVE-2024-10525 (CVSS 7.2) — In Eclipse Mosquitto, from version 1.3.2 through 2.0.18, if a malicious broker sends a crafted SUBACK packet w…
    CVE-2024-8376 (CVSS 7.2) — In Eclipse Mosquitto up to version 2.0.18a, an attacker can achieve memory leaking, segmentation fault or heap…
    CVE-2023-5632 (CVSS 7.5) — In Eclipse Mosquito before and including 2.0.5, establishing a connection to the mosquitto server without send…
    CVE-2023-0809 (CVSS 5.8) — In Mosquitto before 2.0.16, excessive memory is allocated based on malicious initial packets that are not CONN…
    CVE-2023-3592 (CVSS 5.8) — In Mosquitto before 2.0.16, a memory leak occurs when clients send v5 CONNECT packets with a will message that…
    CVE-2021-41039 (CVSS 7.5) — In versions 1.6 to 2.0.11 of Eclipse Mosquitto, an MQTT v5 client connecting with a large number of user-prope…
    CVE-2021-34434 (CVSS 5.3) — In Eclipse Mosquitto versions 2.0 to 2.0.11, when using the dynamic security plugin, if the ability for a clie…
    CVE-2021-34432 (CVSS 7.5) — In Eclipse Mosquitto versions 2.0.7 and earlier, the server will crash if the client tries to send a PUBLISH p…
    CVE-2021-34431 (CVSS 6.5) — In Eclipse Mosquitto version 1.6 to 2.0.10, if an authenticated client that had connected with MQTT v5 sent a …

    References

    https://github.com/eclipse/mosquitto/commit/6113eac95a9df634fbc858be542c4a0456bfe7b9
    https://github.com/eclipse/mosquitto/compare/v2.0.15...v2.0.16
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KJ2FMBGVVQEQWTTQB7YLKTAHMX2UM66X/
    https://mosquitto.org/blog/2023/08/version-2-0-16-released/
    https://security.gentoo.org/glsa/202401-09
    https://www.compass-security.com/fileadmin/Research/Advisories/2023_02_CSNC-2023-001_Eclipse_Mosquitto_Memory_Leak.txt
    https://www.debian.org/security/2023/dsa-5511
    https://github.com/eclipse/mosquitto/commit/6113eac95a9df634fbc858be542c4a0456bfe7b9
    https://github.com/eclipse/mosquitto/compare/v2.0.15...v2.0.16
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KJ2FMBGVVQEQWTTQB7YLKTAHMX2UM66X/
    https://mosquitto.org/blog/2023/08/version-2-0-16-released/
    https://security.gentoo.org/glsa/202401-09
    https://www.compass-security.com/fileadmin/Research/Advisories/2023_02_CSNC-2023-001_Eclipse_Mosquitto_Memory_Leak.txt
    https://www.debian.org/security/2023/dsa-5511

    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