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.
- Score
- CVSS 4.0 6.8 Medium
- Status
- Deferred - disclosure@vulncheck.com
- Published
- 2026-03-16
- Last modified
- 2026-07-28
- Weaknesses
- CWE-798
Affected products
References
- 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
