dbcve.org
WebaccessApplication · Advantech

CVE-2016-0856

CRITICAL · 9.8 CVSS v3.0 Published 2016-01-15
Fix available
A fix is available. Upgrade to after 8.0 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
Multiple stack-based buffer overflows in Advantech WebAccess before 8.1 allow remote attackers to execute arbitrary code via unspecified vectors.

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

Multiple stack-based buffer overflow vulnerabilities in Advantech WebAccess versions before 8.1 allow remote attackers to execute arbitrary code via unspecified vectors. This is a memory corruption vulnerability in an ICS/SCADA web-based monitoring platform that can be exploited without authentication.

MitigationUpgrade to Advantech WebAccess version 8.1 or later to remediate. If immediate patching is not feasible, isolate the affected systems via network segmentation and implement additional compensating controls such as firewalls to limit exposure.

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:<= 8.0

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:3.0/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. Verify Advantech WebAccess is installed
    Check for the presence of the Advantech WebAccess installation directory (commonly in C:\Program Files\Advantech\WebAccess or C:\WebAccess) or look for the 'WebAccess' service in Windows Services.
    Affected if Advantech WebAccess software is found on the system
  2. Determine the installed WebAccess version
    Locate the version information in the installation directory, typically found in an about dialog, version.txt file, or by right-clicking the main executable (such as BwOpc.exe or common DLLs) and selecting Properties > Details to view the File Version.
    Affected if The installed version is 8.0 or lower (any version before 8.1)
  3. Confirm the WebAccess web service is running
    Check if the WebAccess IIS or embedded web server is active by opening Services.msc and looking for 'Advantech WebAccess' or 'WebAccess Node' services, or by attempting to access the web interface on common ports 80 or 443.
    Affected if The web service is running and accessible on the network
  4. Verify the web interface is reachable without authentication
    Attempt to access the WebAccess login page or common endpoints (such as /webaccess/ or the root URL of the server) using a browser or curl command from an external system to confirm the interface accepts unauthenticated connections.
    Affected if The web interface is accessible without requiring login credentials

A system is affected if Advantech WebAccess version 8.0 or lower is installed and its web service is running and accessible, since the buffer overflow vulnerability can be exploited remotely without authentication.

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 8.0
Interim mitigation

Upgrade to Advantech WebAccess version 8.1 or later to remediate. If immediate patching is not feasible, isolate the affected systems via network segmentation and implement additional compensating controls such as firewalls to limit exposure.

Recommended fix Moderate confidence

Advantech WebAccess 8.1

  1. 1. Back up the current Advantech WebAccess configuration and database
  2. 2. Obtain the WebAccess version 8.1 installer from the official Advantech website or support portal
  3. 3. Stop all WebAccess services before upgrading
  4. 4. Install WebAccess version 8.1 on the target system
  5. 5. Restore the configuration from the backup taken in step 1
  6. 6. Restart WebAccess services and verify the application is running correctly
  7. 7. Validate that the upgrade was successful by checking the WebAccess version and ensuring all expected functionality works

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

Fix this in Webaccess Scoped from the published advisory
  • Consultation6.0 h
  • Implementation12.0 h
  • Testing8.0 h
  • Review / QA4.0 h
30.0 hours of engineering $5,280
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $8,448.

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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-2016-0856 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