CVE-2016-20031CWE-798

ZKTeco ZKBioSecurity 3.0 Local Authorization Bypass via visLogin.jsp

Medium · published March 15, 2026

CVSS v4.0
6.8
EPSS
0%
Percentile
4.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
6.8 · MEDIUM
Vector
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
EPSS
0.00152 · 4.0th percentile
Weakness
CWE-798 · Use of Hard-coded Credentials
Published
2026-03-15T13:35Z
EPSS history
Timeline
  • 15 MAR 13:35Z
    ZKTeco ZKBioSecurity 3.0 Local Authorization Bypass via visLogin.jsp
    cvelistv5