CVE-2016-0855
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 · uneditedDirectory traversal vulnerability in Advantech WebAccess before 8.1 allows remote attackers to list arbitrary virtual-directory files 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 · moderate confidenceDirectory traversal vulnerability in Advantech WebAccess versions prior to 8.1 allows remote unauthenticated attackers to access and list files in arbitrary virtual directories by manipulating path traversal sequences, potentially exposing sensitive system files, configuration data, or application source code.
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<= 8.0CVSS 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
- None
- Availability
- None
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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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Identify installed Advantech WebAccess versionCheck the Windows registry key HKEY_LOCAL_MACHINE\SOFTWARE\Advantech\WebAccess\VERSION or inspect the installation directory for version filesAffected if The installed version is 8.0 or earlier (versions prior to 8.1)
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Confirm WebAccess service is runningOpen Windows Services and locate the 'Advantech WebAccess' service, or run 'sc query WebAccess' from command promptAffected if The WebAccess service is installed and running on the system
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Verify web interface accessibilityCheck if the WebAccess web interface port (default HTTP port 80 or configured port) is listening and accessible by running 'netstat -an | findstr :80' or scanning the local hostAffected if The web interface port is open and responds to requests, enabling remote attackers to exploit the path traversal
A system is affected if Advantech WebAccess version 8.0 or earlier is installed with the web interface accessible to network attackers.
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 Advantech WebAccess to version 8.1 or later to obtain the patched version. If immediate patching is not feasible, restrict network access to the WebAccess interface and implement input validation on path-related parameters.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,120.
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Free · runs locallyCheck whether your project pulls in CVE-2016-0855 — 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-2016-0855 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
- No weaponised exploit code, or anything meant to cause harm
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