Security readout for executives and security teams
Plain-English summary
ZKTeco ZKTime.Net installations may allow a low-privileged user to replace application executables because the installation directory is world-writable. If abused, this can turn ordinary local access into higher-privileged code execution. Public exploit references exist, but the provided sources do not show confirmed active exploitation.
Executive priority
Treat this as a high-priority remediation item where ZKTime.Net is present. The impact can be severe on affected hosts, but exposure depends on local access and file permissions. Prioritize inventory, access restriction, and vendor remediation checks.
Technical view
CVE-2016-20024 affects ZKTeco ZKTime.Net 3.0.1.6, with sources also listing 3.0.1.5 and 3.0.1.1. The issue is insecure file permissions on the ZKTimeNet3.0 directory and contents, allowing modification of executables for privilege escalation. CVSS is listed as 9.8 critical, though the described attack requires local file access.
Likely exposure
Organizations using ZKTeco ZKTime.Net for time-attendance or workforce systems are the likely exposure group. Risk is highest where non-admin users can access the Windows host running the application or write to its installation path.
Exploitation context
The source bundle includes Packet Storm and Exploit-DB references, indicating public exploit material exists. CISA KEV status is false in the provided data, and no cited source confirms active exploitation in the wild.
Researcher notes
The CVSS vector in the bundle indicates network, no-privilege exploitation, but the description and advisories characterize the flaw as local privilege escalation through writable files. Validate attack preconditions carefully before scoring exposure. Patch status is not established in the provided sources.
Mitigation direction
- Identify all ZKTeco ZKTime.Net installations and versions.
- Check vendor guidance for fixed versions or supported remediation.
- Restrict write permissions on the ZKTimeNet3.0 installation directory.
- Limit interactive and remote access to hosts running the software.
- Monitor application directories for unauthorized executable changes.
Validation and detection
- Confirm whether versions 3.0.1.6, 3.0.1.5, or 3.0.1.1 are installed.
- Review installation directory permissions for non-admin write access.
- Check file integrity of application executables and related binaries.
- Review endpoint logs for suspicious changes in the application path.
- Document compensating controls if vendor patch information is unavailable.
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-538: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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 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-2016-20024 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
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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 ZKTime.Net 3.0.1.6 Insecure File Permissions Privilege EscalationCVE 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.
Insertion of Sensitive Information into Externally-Accessible File or Directory
Insertion of Sensitive Information into Externally-Accessible File or Directory represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.