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    CVE-2016-20031

    ZKTeco ZKBioSecurity 3.0 contains a local authorization bypass vulnerability in visLogin.jsp that allows attackers to authenticate without valid credentials by spoofing localhost requests. Attackers can exploit the EnvironmentUtil.getClientIp() method which treats IPv6 loopback address 0:0:0:0:0:0:0:1 as 127.0.0.1 and authenticates using the IP as username with hardcoded password 123456 to access sensitive information and perform unauthorized actions.

    Published:Mar 15, 2026
    Last Modified:Jul 28, 2026
    EPS:Mar 15, 2026
    EPSS Score:0.00149
    CVSS Score:5.5

    Affected Products

    Vendor
    Zkteco
    Product
    Zkbiosecurity
    Vendor
    Zkteco
    Product
    Zkbiosecurity Server

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-798 Use of Hard-coded Credentials

    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