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    CVE-2026-3870

    A buffer overflow vulnerability in the UPnP AddPortMapping() command in Zyxel VMG4005-B50B firmware versions through 5.13(ABRL.5.4)C0 could allow an adjacent attacker to trigger a temporary denial-of-service (DoS) condition affecting the UPnP function of the affected device.

    Published:Jun 2, 2026
    Last Modified:Jun 2, 2026
    EPS:Jun 2, 2026
    EPSS Score:0.00016
    CVSS Score:6.5

    Affected Products

    Vendor
    Zyxel
    Product
    Vmg4005-b50b Firmware

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2025-6599 (CVSS 5.3) — An uncontrolled resource consumption vulnerability in the web server of Zyxel DX3301-T0 firmware version 5.50(…
    CVE-2025-7673 (CVSS 9.8) — A buffer overflow vulnerability in the URL parser of the zhttpd web server in Zyxel VMG8825-T50K firmware vers…
    CVE-2024-9200 (CVSS 7.2) — A post-authentication command injection vulnerability in the "host" parameter of the diagnostic function in Zy…
    CVE-2024-8748 (CVSS 7.5) — A buffer overflow vulnerability in the packet parser of the third-party library "libclinkc" in Zyxel VMG8825-T…

    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