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.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.

CVSS v3 5.5 MEDIUM

5.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://cxsecurity.com/issue/WLB-2016090003
https://exchange.xforce.ibmcloud.com/vulnerabilities/116488
https://packetstormsecurity.com/files/138571
https://www.exploit-db.com/exploits/40327/
https://www.vulncheck.com/advisories/zkteco-zkbiosecurity-local-authorization-bypass-via-vislogin-jsp
https://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5367.php

Configurations

No configuration.

History

15 Apr 2026, 14:56

Type	Values Removed	Values Added
Summary		(es) ZKTeco ZKBioSecurity 3.0 contiene una vulnerabilidad de omisión de autorización local en visLogin.jsp que permite a los atacantes autenticarse sin credenciales válidas suplantando solicitudes de localhost. Los atacantes pueden explotar el método EnvironmentUtil.getClientIp() que trata la dirección de bucle invertido IPv6 0:0:0:0:0:0:0:1 como 127.0.0.1 y se autentica usando la IP como nombre de usuario con la contraseña codificada 123456 para acceder a información sensible y realizar acciones no autorizadas.

16 Mar 2026, 14:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-03-16 14:17

Updated : 2026-04-15 14:56

NVD link : CVE-2016-20031

Mitre link : CVE-2016-20031

CVE.ORG link : CVE-2016-20031

JSON object : View

Products Affected

No product.

CWE

CWE-798

Use of Hard-coded Credentials

{"id": "CVE-2016-20031", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "disclosure@vulncheck.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 3.6, "exploitabilityScore": 1.8}], "cvssMetricV40": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.8, "Automatable": "NOT_DEFINED", "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "published": "2026-03-16T14:17:49.920", "references": [{"url": "https://cxsecurity.com/issue/WLB-2016090003", "source": "disclosure@vulncheck.com"}, {"url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/116488", "source": "disclosure@vulncheck.com"}, {"url": "https://packetstormsecurity.com/files/138571", "source": "disclosure@vulncheck.com"}, {"url": "https://www.exploit-db.com/exploits/40327/", "source": "disclosure@vulncheck.com"}, {"url": "https://www.vulncheck.com/advisories/zkteco-zkbiosecurity-local-authorization-bypass-via-vislogin-jsp", "source": "disclosure@vulncheck.com"}, {"url": "https://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5367.php", "source": "disclosure@vulncheck.com"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Primary", "source": "disclosure@vulncheck.com", "description": [{"lang": "en", "value": "CWE-798"}]}], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "ZKTeco ZKBioSecurity 3.0 contiene una vulnerabilidad de omisi\u00f3n de autorizaci\u00f3n local en visLogin.jsp que permite a los atacantes autenticarse sin credenciales v\u00e1lidas suplantando solicitudes de localhost. Los atacantes pueden explotar el m\u00e9todo EnvironmentUtil.getClientIp() que trata la direcci\u00f3n de bucle invertido IPv6 0:0:0:0:0:0:0:1 como 127.0.0.1 y se autentica usando la IP como nombre de usuario con la contrase\u00f1a codificada 123456 para acceder a informaci\u00f3n sensible y realizar acciones no autorizadas."}], "lastModified": "2026-04-15T14:56:45.970", "sourceIdentifier": "disclosure@vulncheck.com"}