CVE-2016-20031 Details
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.
A local authorization bypass vulnerability has been identified in ZKTeco ZKBioSecurity version 3.0.1.0_R_230, specifically within the visLogin.jsp file. This vulnerability allows attackers to authenticate without valid credentials by spoofing localhost requests. The issue arises because the EnvironmentUtil.getClientIp() method incorrectly interprets the IPv6 loopback address as a standard IPv4 loopback address, enabling authentication with a hardcoded password. Exploitation of this vulnerability could lead to unauthorized access to sensitive information and the ability to perform actions without proper authorization.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Mar 16, 2026CISA-ADP
Assessed Mar 16, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://cxsecurity.com/issue/WLB-2016090003 | [email protected] | ExploitTechnical Description |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/116488 | [email protected] | Advisory |
| https://packetstormsecurity.com/files/138571 | [email protected] | ExploitTechnical Description |
| https://www.exploit-db.com/exploits/40327/ | [email protected] | ExploitTechnical Description |
| https://www.vulncheck.com/advisories/zkteco-zkbiosecurity-local-authorization-bypass-via-vislogin-jsp | [email protected] | AdvisoryBundle |
| https://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5367.php | [email protected] | AdvisoryExploitRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-798 | Use of Hard-coded Credentials | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| ZKTeco ZKBioSecurity | All versions |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 8, 2026 | CVE Modified | [email protected] |
| Mar 16, 2026 | New CVE Received | [email protected] |