CVE-2016-20031 MEDIUM

CVE-2016-20031: ZKTeco ZKBioSecurity 3.0 Local Authorization Bypass via visLogin.jsp

Vendor Zkteco Inc.

Product ZKTeco ZKBioSecurity

Weakness CWE-798 · Hardcoded credentials

Published March 15, 2026

Last update June 8, 2026

View on NVD All CVEs

CVSS base score

6.8/10

Attack vector Local

Attack complexity Low

Privileges required Low

User interaction None

Confidentiality —

Integrity —

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 15, 2026 CVE published

June 8, 2026 Record updated

External resources

03References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2016-20031 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/798.html

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