HOMEVULNERABILITIESCVE-2016-20031
MEDIUM

CVE-2016-20031

CWE-798Published: March 16, 2026· Updated: Mar 16, 2026

5.5
CVSS v3.1
EPSS:0.01%probability of exploitation in 30 daysPercentile:1.3th

Official Description

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.

NVD Source

Technical Analysis

CVE-2016-20031 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 5.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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All References (6)

→
https://cxsecurity.com/issue/WLB-2016090003
→
https://exchange.xforce.ibmcloud.com/vulnerabilities/116488
→
https://packetstormsecurity.com/files/138571
→
https://www.exploit-db.com/exploits/40327/
→
https://www.vulncheck.com/advisories/zkteco-zkbiosecurity-local-authorization-bypass-via-vislogin-jsp
→
https://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5367.php

Quick Facts

CVE IDCVE-2016-20031
CVSS Score5.5 / 10
SeverityMEDIUM
WeaknessCWE-798
CISA KEVNo
EPSS (30d)0.01%
PublishedMar 16, 2026

Related CVEs (CWE-798)

CVE-2026-13768
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CVE-2026-49201
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CVE-2026-22769
KEV10.0
CVE-2026-45631
10.0
CVE-2026-11849
9.8
CVE-2026-22900
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2016-20031 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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