dbcve.org
WebaccessApplication · Advantech

CVE-2019-13558

CRITICAL · 9.8 CVSS v3.1 Published 2019-09-18
Fix available
A fix is available. Upgrade to after 8.4.1 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
In WebAccess versions 8.4.1 and prior, an exploit executed over the network may cause improper control of generation of code, which may allow remote code execution, data exfiltration, or cause a system crash.

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 confidence

WebAccess versions 8.4.1 and prior contain a vulnerability exploitable over the network that allows improper control of code generation, leading to remote code execution, data exfiltration, or system crashes. The vulnerability has a CVSS score of 9.8, indicating critical severity with network-based exploitability.

MitigationUpgrade WebAccess to a version beyond 8.4.1. If immediate patching is not feasible, implement network segmentation and restrict access to affected systems to reduce attack surface.

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:<= 8.4.1

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. Identify if Advantech WebAccess is installed
    Check the system for WebAccess installation directories, services, or the WebAccess Dashboard application. Common locations include C:\WebAccess or C:\Advantech\WebAccess on Windows systems.
    Affected if WebAccess software is present on the system
  2. Locate the installed WebAccess version
    Check the version information of the installed WebAccess application. This may be found in the program files directory, in an about page of the web interface, or through the Windows installed programs list.
    Affected if The installed version cannot be determined or is 8.4.1 or lower
  3. Compare installed version against affected range
    Review the identified version number and compare it to the affected range: any version 8.4.1 or lower is vulnerable.
    Affected if The installed version is 8.4.1 or any earlier version number
  4. Verify network accessibility of WebAccess services
    Determine if the WebAccess web interface or associated services are accessible over the network. Check firewall rules, listening ports (typically 80/443 for web services), and network exposure of the host.
    Affected if WebAccess is network-accessible from untrusted locations

You are affected if Advantech WebAccess version 8.4.1 or earlier is installed and the service is accessible over a network.

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 8.4.1
Interim mitigation

Upgrade WebAccess to a version beyond 8.4.1. If immediate patching is not feasible, implement network segmentation and restrict access to affected systems to reduce attack surface.

Recommended fix Moderate confidence

WebAccess 8.4.2 or later

  1. 1. Back up all WebAccess project files, configurations, and databases before any upgrade
  2. 2. Download the latest version of Advantech WebAccess from the official vendor website or support portal
  3. 3. Stop all WebAccess services and IIS services running the WebAccess application
  4. 4. Install the upgraded WebAccess version (version 8.4.2 or later, which contains the security fix for CVE-2019-13558)
  5. 5. After installation, verify that all WebAccess services start successfully
  6. 6. Validate that the web interface is accessible and functioning correctly
  7. 7. Test critical operations to ensure normal functionality post-upgrade
  8. 8. Review system logs for any errors or anomalies
Caveat Review release notes for any breaking changes between 8.4.1 and the target version; test in a non-production environment first

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

Fix this in Webaccess Scoped from the published advisory
  • Consultation8.0 h
  • Implementation16.0 h
  • Testing12.0 h
  • Review / QA4.0 h
40.0 hours of engineering $7,000
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $11,200.

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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-2019-13558 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