CVE-2016-20030

CRITICAL EPSS 42.6%

Published Mar 16, 20263mo ago · Modified Jun 8, 20263w ago

9.3 CVSS 4.0

Critical

Published Mar 16, 2026 3mo ago

Last Modified Jun 8, 2026 3w ago

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.

CVSS Details

Base Score

9.3

Exploitability

—

Impact

—

Vector string

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector Network

Attack Complexity Low

Privileges Required None

User Interaction None

Scope X

Threat Intelligence

EPSS Exploit Probability

42.6% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-551

References 4

exchange.xforce.ibmcloud.com https://exchange.xforce.ibmcloud.com/vulnerabilities/116485
packetstormsecurity.com https://packetstormsecurity.com/files/138573
vulncheck.com https://www.vulncheck.com/advisories/zkteco-zkbiosecurity-user-enumeration-via-authloginaction
zeroscience.mk https://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5366.php

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.