What is CVE-2016-20031?

CVE-2016-20031 is a medium-severity vulnerability in Zkteco Inc. Zkbiosecurity, classified under Use of Hard-coded Credentials. CVSS score: 5.5/10. Published 2026-03-15.

How severe is CVE-2016-20031?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Zkteco Inc. Zkbiosecurity

CVE-2016-20031

ZKTeco ZKBioSecurity 3.0 contains a local authorization bypass vulnerability in visLogin.jsp that allows attackers to authenticate without valid credentials by spoofing localhost requests. Attackers can exploit the EnvironmentUtil.getClien…

EPSS: 0.000 (0.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

Affected products

Zkteco Inc. Zkbiosecurity — versions 3.0.1.0_R_230

Weakness classification (CWE)

CWE-798 — Use of Hard-coded Credentials

References

Zero Science Lab Disclosure (third-party-advisory)
CXSecurity (third-party-advisory)
IBM X-Force Exchange (vdb-entry)
Packet Storm Security (exploit)
Reference (exploit)
VulnCheck Advisory: ZKTeco ZKBioSecurity 3.0 Local Authorization Bypass via visLogin.jsp (third-party-advisory)

Frequently asked questions

What is CVE-2016-20031?: CVE-2016-20031 is a medium-severity vulnerability in Zkteco Inc. Zkbiosecurity, classified under Use of Hard-coded Credentials. CVSS score: 5.5/10. Published 2026-03-15.
How severe is CVE-2016-20031?: Medium severity. CVSS v3 base score is 5.5 out of 10.