CVE-2016-20031ZKTeco ZKBioSecurity 3.0 Local Authorization Bypass via visLogin.jsp
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It affects ZKTeco Inc. ZKTeco ZKBioSecurity. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 5.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- Weakness (CWE)
- CWE-798
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Jul 27, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
ZKTeco Inc. ZKTeco ZKBioSecurity zkteco:zkbiosecurity (from the name) | 3.0.1.0_R_230 | CNA record |
References
- https://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5367.phpthird-party-advisory
- https://cxsecurity.com/issue/WLB-2016090003third-party-advisory
- https://exchange.xforce.ibmcloud.com/vulnerabilities/116488vdb-entry
- https://packetstormsecurity.com/files/138571exploit
- https://www.exploit-db.com/exploits/40327/exploit
- https://www.vulncheck.com/advisories/zkteco-zkbiosecurity-local-authorization-bypass-via-vislogin-jspthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.