CVE-2016-20031Public exploit

Local authorization bypass via hard-coded credentials

Published Mar 15, 2026 · Updated Mar 15, 2026

Authorization bypass in ZKTeco ZKBioSecurity 3.0.1.0_R_230 allows local users to read protected data through visLogin.jsp. EnvironmentUtil.getClientIp() rewrites the IPv6 loopback address as 127.0.0.1, which the page submits with hard-coded password 123456. A request must originate on the server host, and the resulting authenticated session permits disclosure of protected information.

CVSS severity6.8
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in ZKTeco ZKBioSecurity 3.0.1.0_R_230 allows local users to read protected data through visLogin.jsp. EnvironmentUtil.getClientIp() rewrites the IPv6 loopback address as 127.0.0.1, which the page submits with hard-coded password 123456. A request must originate on the server host, and the resulting authenticated session permits disclosure of protected information.

The record

CVE
CVE-2016-20031
Published
Mar 15, 2026
Updated
Mar 15, 2026
Vendor
ZKTeco
Product
ZKBioSecurity
Classifications
CWE-798, T1078
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.0.1.0_R_230

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

ZKTeco · ZKBioSecurityversion=3.0.1.0_R_230

Published CVSS scores

5.5VulnCheckCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
6.8VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-798Use of Hard-coded Credentials
T1078Valid Accounts

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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