Local Authorization Bypass Vulnerability in ZKTeco ZKBioSecurity 3.0
CVE-2016-20031

6.8MEDIUM

Key Information:

Vendor

Zkteco Inc.

Status
Zkteco ZkbiOSecurity
Vendor
CVE Published:
15 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2016-20031?

ZKTeco's ZKBioSecurity 3.0 features a critical vulnerability that enables an attacker to bypass authentication through local spoofing. By exploiting the EnvironmentUtil.getClientIp() method, an attacker can authenticate to the system without valid credentials by using the IPv6 loopback address treated as localhost. With a hardcoded password of 123456, unauthorized users can gain access to sensitive information and execute unauthorized actions within the system.

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Affected Version(s)

ZKTeco ZKBioSecurity 3.0.1.0_R_230

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2016-20031 - Proof of Concept

CVE-2016-20031 - Proof of Concept

References

https://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-53...
third-party-advisory
https://cxsecurity.com/issue/WLB-2016090003
third-party-advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/116488
vdb-entry

CVSS V4

Score:
6.8
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

LiquidWorm as Gjoko Krstic of Zero Science Lab
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