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CVE-2016-20031

MEDIUM

5.5

Description

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.getClientIp() method which treats IPv6 loopback address 0:0:0:0:0:0:0:1 as 127.0.0.1 and authenticates using the IP as username with hardcoded password 123456 to access sensitive information and perform unauthorized actions.

CVE Details

CVSS v3.1 Score5.5

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Attack VectorLOCAL

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published3/16/2026

Last Modified3/16/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-798

References

https://cxsecurity.com/issue/WLB-2016090003(disclosure@vulncheck.com)

https://exchange.xforce.ibmcloud.com/vulnerabilities/116488(disclosure@vulncheck.com)

https://packetstormsecurity.com/files/138571(disclosure@vulncheck.com)

https://www.exploit-db.com/exploits/40327/(disclosure@vulncheck.com)

https://www.vulncheck.com/advisories/zkteco-zkbiosecurity-local-authorization-bypass-via-vislogin-jsp(disclosure@vulncheck.com)

https://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5367.php(disclosure@vulncheck.com)

IOC Correlations

No correlations recorded

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