CVE-2019-13556
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 · uneditedIn WebAccess versions 8.4.1 and prior, multiple stack-based buffer overflow vulnerabilities are caused by a lack of proper validation of the length of user-supplied data. Exploitation of these vulnerabilities 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 · moderate confidenceMultiple stack-based buffer overflow vulnerabilities exist in WebAccess versions 8.4.1 and prior due to lack of proper validation of user-supplied data length. These memory corruption flaws can be exploited to achieve remote code execution.
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<= 8.4.1CVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/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 checksWork through these to decide whether this CVE applies to you.
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Confirm WebAccess installationCheck for Advantech WebAccess installation directory (commonly at C:\Advantech\WebAccess or C:\Program Files\Advantech\WebAccess) or look for the WebAccess service in Windows Services (services.msc)Affected if WebAccess is not installed on the system
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Retrieve installed WebAccess versionCheck the version of waAppMgr.exe or waBrowser.exe in the WebAccess installation directory, or look in Windows Registry under HKLM\SOFTWARE\Advantech\WebAccess for the Version valueAffected if Unable to locate version information for comparison
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Compare version to affected rangeCompare the installed version number to the affected range: any version 8.4.1 or lower is within the affected rangeAffected if Installed version is 8.4.1 or any earlier version (e.g., 8.4.0, 8.3.x, 8.2.x, etc.)
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Identify accessible network interfacesCheck if the WebAccess web service (typically on ports 80, 443, or 8080) is exposed to network access by reviewing IIS configuration or the WebAccess service bindingsAffected if WebAccess web interface is accessible from network and version is within affected range
System is affected if Advantech WebAccess version 8.4.1 or lower is installed and the web interface is network-accessible, since the buffer overflow vulnerability can be triggered via user-supplied data.
Generated from the published advisory. Verify against your own configuration.
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.
From vendor dataUpgrade WebAccess to a version newer than 8.4.1. If upgrades are not immediately feasible, implement proper input validation and bounds checking on all user-supplied data, particularly in the identified vulnerable code paths.
- Consultation6.0 h
- Implementation12.0 h
- Testing10.0 h
- Review / QA6.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-13556 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2019-13556 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
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