Security readout for executives and security teams
Plain-English summary
CVE-2016-20025 affects ZKTeco ZKAccess Professional 3.5.3 Build 0005. A logged-in user may be able to replace program files because permissions are too broad, potentially gaining higher privileges. This is serious for physical access-control environments, but public sources do not show confirmed active exploitation or a named vendor patch.
Executive priority
Treat as high priority if this software supports door access, attendance, or security operations. The issue can turn a low-privileged account into broader system control. Prioritize identification, permission hardening, and vendor guidance review.
Technical view
The issue is insecure file permissions in ZKTeco ZKAccess Professional 3.5.3 Build 0005. Authenticated Users reportedly have Modify permission on executable files, enabling replacement of binaries and privilege escalation. The CVSS 3.1 score is 8.8, with low attack complexity and low privileges required. Public exploit references exist, but KEV status is false.
Likely exposure
Exposure is likely limited to organizations running ZKTeco ZKAccess Professional 3.5.3 Build 0005. Risk is higher where non-administrative authenticated users can interact with the affected installation path or host. Confirm exposure through asset inventory and file-permission review.
Exploitation context
Public exploit entries are listed by Packet Storm and Exploit-DB, so defenders should assume the technique is publicly documented. However, the provided sources do not indicate CISA KEV listing or confirmed active exploitation in the wild.
Researcher notes
The record is newly published under a 2016 CVE ID and references older third-party disclosures. Sources support the affected version and insecure-permission privilege escalation. Patch availability is not established in the provided sources. Do not infer active exploitation from exploit availability alone.
Mitigation direction
- Check ZKTeco guidance for updates, replacement builds, or vendor-recommended remediation.
- Restrict Modify permissions on ZKAccess executable directories to trusted administrators only.
- Limit interactive and remote access to hosts running ZKAccess Professional.
- Monitor affected directories for unexpected executable changes.
- Prioritize compensating controls if the product cannot be upgraded.
Validation and detection
- Inventory systems for ZKTeco ZKAccess Professional 3.5.3 Build 0005.
- Review installation directory permissions for Authenticated Users Modify access.
- Check executable file integrity against known-good baselines where available.
- Review endpoint logs for unexpected binary changes in the product directory.
- Confirm whether vendor guidance or a newer safe version is available.
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-552: 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-2016-20025 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
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/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:L/UI:N/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/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 ZKAccess Professional 3.5.3 Privilege Escalation via Insecure PermissionsCVE 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.
Files or Directories Accessible to External Parties
Files or Directories Accessible to External Parties represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.