CVE-2016-20031 — ZKTeco ZKBioSecurity 3.0 Local Authorization Bypass via visLogin.jsp
ZKTeco ZKBioSecurity 3.0 contains a local authorization bypass vulnerability in visLogin.jsp that allows attackers to authenticate without valid credentials by spoofing localhos…
Published: 2026-03-15 · CVSS: 6.8 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7