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CVE-2016-20030

CRITICAL Exploitation: PoC
9.8
CVSS 3.1
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.

Metadata

CVE ID
CVE-2016-20030
State
PUBLISHED
Assigner
VulnCheck
Reserved
2026-03-15 12:37 UTC
Published
2026-03-15 13:35 UTC
Last updated
2026-06-08 15:11 UTC
Primary CWE
CWE-551
Incorrect Behavior Order: Authorization Before Parsing and C…
Vendor / Product
ZKTeco Inc. / ZKTeco ZKBioSecurity
Sources
cve.org  ·  NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC — CISA Coordinator
Exploitation
PoC
Automatable
yes
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
ZKTeco Inc. ZKTeco ZKBioSecurity — 3.0.1.0_R_230
Weakness (CWE)
CWESourceDescription
CWE-551 cna Incorrect Behavior Order: Authorization Before Parsing and Canonicalization
CVSS scores (2)
ScoreSeverityVersionSourceVector
9.8 CRITICAL 3.1 cna CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3 CRITICAL 4.0 cna 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
References (4)
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