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WebaccessApplication · Advantech

CVE-2020-12002

CRITICAL · 9.8 CVSS v3.1 Published 2020-05-08
Fix available
A fix is available. Upgrade to after 8.4.4 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Advantech WebAccess Node, Version 8.4.4 and prior, Version 9.0.0. Multiple stack-based buffer overflow vulnerabilities exist caused by a lack of proper validation of the length of user-supplied data, which may allow remote code execution.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

Advantech WebAccess Node versions 8.4.4 and prior, and 9.0.0 contain multiple stack-based buffer overflow vulnerabilities. The vulnerabilities stem from insufficient validation of user-supplied data length before copying into fixed-size stack buffers, allowing attackers to overwrite adjacent memory and achieve remote code execution.

MitigationApply vendor patches if available; otherwise implement strict input length validation on all user-supplied data paths and consider network segmentation to limit exposure of the affected service.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
WebaccessApplication
Affected:<= 8.4.4= 9.0.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Locate Advantech WebAccess Node installation
    Search for the WebAccess installation directory, typically found under C:\Advantech\WebAccess\Node or C:\Program Files\Advantech\WebAccess\Node. Check for the presence of the main executable (e.g., WaIISManager.exe or similar WebAccess binaries).
    Affected if The software is not found in standard installation paths, the version cannot be determined, or the software is confirmed uninstalled.
  2. Identify installed version of WebAccess Node
    Right-click on the main executable or DLL files within the WebAccess installation folder, select Properties, and view the Version tab. Alternatively, check the software's About dialog if accessible through the web interface or application menu.
    Affected if The installed version is 8.4.4 or any earlier version, or the installed version is exactly 9.0.0.
  3. Confirm the web service is accessible
    Attempt to access the WebAccess Node web interface by navigating to the host's IP address or hostname on the typical HTTP ports used by WebAccess (such as 80 or 8080). Verify the service responds.
    Affected if The web interface is accessible and responds, confirming the vulnerable component is exposed.
  4. Check if IIS or built-in web server is running
    Open Windows Services console (services.msc) and look for services related to Advantech WebAccess or IIS. Alternatively, run 'netstat -an | findstr :80' to check if port 80 or associated ports are listening.
    Affected if The WebAccess web service is running and listening on network ports, making the vulnerability reachable.

A system is affected if Advantech WebAccess Node version 8.4.4 or prior, or version 9.0.0 is installed and the web interface service is running and accessible.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to a release after 8.4.4
Interim mitigation

Apply vendor patches if available; otherwise implement strict input length validation on all user-supplied data paths and consider network segmentation to limit exposure of the affected service.

Recommended fix Moderate confidence

Contact Advantech for the patched version (versions after 9.0.0)

  1. Identify the current Advantech WebAccess Node version in use
  2. Contact Advantech technical support to obtain the patched version beyond 9.0.0
  3. Review release notes or security advisories for the fixed version
  4. Plan upgrade in a staging environment first
  5. Test the upgrade to ensure compatibility with existing configurations
  6. Schedule maintenance window for production upgrade
  7. Apply the upgrade following vendor installation documentation
  8. Verify the installation and test that WebAccess Node functions correctly
Caveat Testing in staging recommended before production upgrade to ensure compatibility

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Webaccess Scoped from the published advisory
  • Consultation6.0 h
  • Implementation16.0 h
  • Testing8.0 h
  • Review / QA4.0 h
34.0 hours of engineering $6,000
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $9,600.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2020-12002 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data