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    CVE-2021-3297

    On Zyxel NBG2105 V1.00(AAGU.2)C0 devices, setting the login cookie to 1 provides administrator access.

    Published:Jan 26, 2021
    Last Modified:Nov 25, 2025
    EPS:Jan 26, 2021
    EPSS Score:0.86355
    CVSS Score:7.8

    Affected Products

    Vendor
    Zyxel
    Product
    Nbg2105
    Vendor
    Zyxel
    Product
    Nbg2105 Firmware

    Exploits

    https://github.com/nieldk/vulnerabilities/blob/main/zyxel%20nbg2105/Admin%20bypasshttps://github.com/nieldk/vulnerabilities/blob/main/zyxel%20nbg2105/Admin%20bypass

    Common Weakness Enumeration

    CWE-287 Improper Authentication

    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