Security readout for executives and security teams
Plain-English summary
CVE-2016-20031 affects ZKTeco ZKBioSecurity 3.0.1.0_R_230. A local user can bypass login checks by abusing how the application trusts localhost-style requests. This could expose sensitive information and allow unauthorized actions inside a physical security management system. It is not listed in CISA KEV, so active exploitation is not confirmed by the provided sources.
Executive priority
Treat as a medium-priority remediation item unless the system manages high-value physical access or biometric data. Prioritize inventory and access restriction first. Escalate if the host is shared, broadly accessible, or supports critical facilities operations.
Technical view
The issue is a local authorization bypass in visLogin.jsp. The application’s EnvironmentUtil.getClientIp() logic treats the IPv6 loopback address as localhost and authenticates using IP-derived logic with a hardcoded password. The CVE is mapped to CWE-798 and scored CVSS 4.0 6.8 with local attack vector, low complexity, and high confidentiality impact.
Likely exposure
Exposure is most relevant where ZKBioSecurity 3.0.1.0_R_230 is installed and local users or footholds exist on the application host. Internet exposure is not supported by the CVSS vector or provided description. Systems managing access control, attendance, or biometric security data may carry higher business impact.
Exploitation context
Public exploit references exist on Packet Storm and Exploit-DB, but the source bundle does not show CISA KEV listing or confirmed active exploitation. The attack requires local access and low privileges according to the CVSS vector, making it more concerning after initial compromise or for insider misuse.
Researcher notes
Evidence supports a local authorization bypass in one named ZKBioSecurity version. The provided sources include exploit databases, but do not establish in-the-wild exploitation. No vendor patch details are included in the bundle, so remediation should be tied to vendor guidance and compensating access controls.
Mitigation direction
- Confirm whether ZKBioSecurity 3.0.1.0_R_230 is deployed.
- Check ZKTeco guidance for supported updates or vendor-recommended remediation.
- Restrict local access to the ZKBioSecurity application host.
- Limit administrative and interactive logon rights on the server.
- Monitor authentication and application logs for anomalous localhost-based access.
- Place the system on a restricted management network where feasible.
Validation and detection
- Inventory ZKBioSecurity instances and record exact version numbers.
- Review whether visLogin.jsp exists on affected installations.
- Verify who has local or interactive access to the host.
- Review logs for unexpected localhost authentication events.
- Confirm compensating controls restrict host access and administrative logons.
- Track vendor advisories for patch or upgrade guidance.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-798: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2016-20031 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.8 (4.0)
- Known Exploited
- No
- Published
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
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
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——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
6.8MediumVector: 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
Source materials
- CVE List V5 sourceCVE List V5
- Zero Science Lab DisclosureCVE reference · third-party-advisory
- CXSecurityCVE reference · third-party-advisory
- IBM X-Force ExchangeCVE reference · vdb-entry
- Packet Storm SecurityCVE reference · exploit
- ReferenceCVE reference · exploit
- VulnCheck Advisory: ZKTeco ZKBioSecurity 3.0 Local Authorization Bypass via visLogin.jspCVE reference · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Use of Hard-coded Credentials
Use of Hard-coded Credentials represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.