CVE-2016-20030
CRITICALDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
TridentStack Control tracks known vulnerabilities across your Windows, macOS, and Linux fleet and shows the fix as soon as one is published. See how it works
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploit Intelligence
Moderate risk: more likely to be exploited than 44% of all known CVEs.
References
Related Vulnerabilities
Other CWE-551 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2021-34429 | Medium | 5.3 | 99% | - | Fix |
| CVE-2021-28164 | Medium | 5.3 | 82% | - | Fix |
| CVE-2021-28165 | High | 7.5 | 54% | - | Fix |
| CVE-2023-23924 | Critical | 10.0 | 3.6% | - | - |
| CVE-2021-32777 | High | 8.6 | 3.3% | - | Fix |
| CVE-2026-44575 | High | 7.5 | 1.6% | - | Fix |
Common questions
How do I fix CVE-2016-20030?
No published fix for CVE-2016-20030 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2016-20030 being actively exploited?
Not that we know of. CVE-2016-20030 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.56% is the estimated probability that it will be exploited in the next 30 days. That is higher than 44% of all scored CVEs.
How severe is CVE-2016-20030?
CVE-2016-20030 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
Embed a live status badge for CVE-2016-20030
Markdown
[](https://tridentstack.com/cve/CVE-2016-20030)HTML
<a href="https://tridentstack.com/cve/CVE-2016-20030"><img src="https://tridentstack.com/cve/badge/CVE-2016-20030.svg" alt="CVE-2016-20030"></a>Find and fix vulnerabilities across your fleet
TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.
This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-08.