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CVE-2016-20031

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CVE-2016-20031

Published: Mar 15, 2026

Modified: Mar 16, 2026

PUBLISHED

CVSS v3.1

5.5

MEDIUM

Description

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.

VendorProductVersions

ZKTeco Inc.

ZKTeco ZKBioSecurity

affected
3.0.1.0_R_230

Weaknesses (CWE)

CWE-798

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

References

Zero Science Lab Disclosure
third-party-advisory
CXSecurity
third-party-advisory
Reference
exploit

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