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CVE-2016-20030

ZKTeco ZKBioSecurity 3.0 User Enumeration via authLoginAction

Critical9.3EPSS 0.58%
Published
Updated
Reserved
Assigned by
VulnCheck

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.

Scores

CVSS scores of CVE-2016-20030, by who scored it
Scored byCVSSScoreVector
VulnCheckCNA (assigner)4.0Critical9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
VulnCheckCNA (assigner)3.1Critical9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Deferred4.0Critical9.3CVSS: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
EPSS (exploitation in 30 days)
0.58% · top 52% of all CVEs (2 Nov 2026)
CISA SSVC
Exploitation: poc · Automatable: yes · Technical impact: partial

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The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.3.

Weakness

Affected products

  • ZKTeco Inc. · ZKTeco ZKBioSecurity

    • affected 3.0.1.0_R_230

What to do

Solution: The affected software ZKBioSecurity and ZKAccess have been officially discontinued. It is recommended that users switch to using ZKBio CVSecurity software. ZKBio CVSecurity has fixed these vulnerabilities. It is recommended that customers use the latest version of ZKBio CVSecurity to eliminate risks.

References (4)

Sources

The same CVE in the primary databases and aggregators, to check against.

Record last updated .