CVE-2019-3942
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 · uneditedAdvantech WebAccess 8.3.4 does not properly restrict an RPC call that allows unauthenticated, remote users to read files. An attacker can use this vulnerability to recover the administrator password.
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 confidenceAdvantech WebAccess 8.3.4 contains an improperly restricted RPC interface that allows unauthenticated remote attackers to read arbitrary files from the system, enabling recovery of the administrator password hash and subsequent administrative access.
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= 8.3.4CVSS 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:3.1/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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Verify Advantech WebAccess versionLocate the WebAccess installation directory and check the version information. Common paths include C:\WebAccess or C:\Program Files\Advantech\WebAccess. Look for version.txt, about dialog, or check the service name/version in Windows Services.Affected if The installed version is exactly 8.3.4
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Identify the RPC service portCheck the WebAccess configuration files (typically in the \WebAccess\NODE directory) for RPC service configuration. Common ports include 4592/TCP. Use netstat -ano | findstr "4592" or similar to see if the port is listening.Affected if The RPC service (typically port 4592/TCP) is listening and bound to a network-accessible interface
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Confirm network exposure of RPC interfaceCheck Windows Firewall rules or external firewall configurations to determine if the RPC port (4592/TCP) is accessible from network segments outside the local host. Run netsh advfirewall firewall show rule name=all or review perimeter firewall rules.Affected if The RPC port is open through any firewall to untrusted network segments or the internet
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Test unauthenticated RPC accessIf the service is exposed, use an RPC client tool or curl to send a request to the RPC interface without providing authentication credentials. A vulnerable system will accept the request and return data.Affected if The RPC interface accepts and processes requests without requiring authentication
A system is affected if Advantech WebAccess version 8.3.4 is installed AND the RPC service port is network-accessible without authentication.
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 dataApply vendor patches for Advantech WebAccess or upgrade to a patched version; if no patch available, restrict RPC port access via firewall and disable unnecessary RPC services.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 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 $5,600.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-3942 — 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-2019-3942 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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