CVE-2016-20030 - CVE House
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Status published Critical CVE-2016-20030

ZKTeco ZKBioSecurity 3.0 User Enumeration via authLoginAction

Vulnerability Description

ZKTeco ZKBioSecurity 3.0 contains a user enumeration vulnerability that allows unauthenticated attackers to discover valid usernames by submitting partial characters via the username parameter. Attackers can send requests to the authLoginAction!login.do script with varying username inputs to enumerate valid user accounts based on application responses.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • LiquidWorm as Gjoko Krstic of Zero Science Lab

References

More from ZKTeco Inc.

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CVE-2016-20032
ZKTeco ZKAccess Security System 5.3.1 Stored XSS
Medium 5.1
CVE-2016-20031
ZKTeco ZKBioSecurity 3.0 Local Authorization Bypass via visLogin.jsp
Medium 6.8
CVE-2016-20029
ZKTeco ZKBioSecurity 3.0 File Path Manipulation Vulnerability
Medium 6.9
CVE-2016-20028
ZKTeco ZKBioSecurity 3.0 Cross-Site Request Forgery Superadmin
Medium 5.3
CVE-2016-20027
ZKTeco ZKBioSecurity 3.0 Multiple Reflected XSS Vulnerabilities
Medium 5.1

Affected Vendor

ZKTeco Inc.

View all reports →

Affected Software

ZKTeco ZKBioSecurity
Vulnerable Versions:
3.0.1.0_R_230

Timeline

Official Publish: March 15th, 2026
Last Modified: June 8th, 2026
Added to House: July 20th, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses (CWE)

CWE-551

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.