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    CVE-2026-87121

    lwIP TCP/IP Stack MQTT is vulnerable to an out-of-bounds write, which may allow an attacker to gain full code execution on the device.

    Published:Sep 22, 2026
    Last Modified:Sep 23, 2026
    EPS:Sep 22, 2026
    EPSS Score:0.00775
    CVSS Score:9.8

    Affected Products

    Vendor
    Lwip
    Product
    Tcp/ip Stack Mqtt

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-787 Out-of-bounds Write

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    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