Vulnerability in Zkteco Inc. Zkbiosecurity
CVE-2016-20030
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (44.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Zkteco Inc. Zkbiosecurity — versions 3.0.1.0_R_230
Weakness classification (CWE)
References
- Zero Science Lab Disclosure (third-party-advisory)
- IBM X-Force Exchange (vdb-entry)
- Packet Storm Security (exploit)
- VulnCheck Advisory: ZKTeco ZKBioSecurity 3.0 User Enumeration via authLoginAction (third-party-advisory)
Frequently asked questions
- What is CVE-2016-20030?
- CVE-2016-20030 is a critical-severity vulnerability in Zkteco Inc. Zkbiosecurity, classified under CWE-551. CVSS score: 9.8/10. Published 2026-03-16.
- How severe is CVE-2016-20030?
- Critical severity. CVSS v3 base score is 9.8 out of 10.