CVE-2011-4041
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 · uneditedwebvrpcs.exe in Advantech/BroadWin WebAccess allows remote attackers to execute arbitrary code or obtain a security-code value via a long string in an RPC request to TCP port 4592.
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 confidenceBuffer overflow vulnerability in webvrpcs.exe (Advantech/BroadWin WebAccess) allows remote attackers to execute arbitrary code via a long string in RPC requests to TCP port 4592. No authentication is required for exploitation, giving attackers complete compromise of the affected system.
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 dataall versionsCVSS 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
- Authentication
- None
- Confidentiality
- Complete
- Integrity
- Complete
- Availability
- Complete
AV:N/AC:L/Au:N/C:C/I:C/A:C
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 if Advantech/BroadWin WebAccess software is installed on the system by looking for installation directories (commonly C:\WebAccess or C:\BroadWeb) or checking Add/Remove Programs for WebAccess entries.Affected if The software is installed and no patch has been applied.
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Locate webvrpcs.exeFind the webvrpcs.exe binary on the system. Typical paths include C:\WebAccess\node\webvrpcs.exe or C:\BroadWeb\webvrpcs.exe. Use file search or check the installation directory.Affected if The webvrpcs.exe binary exists on the system.
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Verify webvrpcs.exe is runningCheck if the webvrpcs.exe process is active by running 'tasklist | findstr webvrpcs.exe' or using Process Explorer. Also verify it is listening on port 4592 using 'netstat -an | findstr 4592'.Affected if The process is running and listening on TCP port 4592.
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Confirm port 4592 accessibilityCheck if TCP port 4592 is open and listening on the system using 'netstat -an' or by scanning the local host with a port scanner. Verify if the service accepts RPC requests.Affected if Port 4592 is open and accepting connections.
If BroadWin WebAccess is installed with webvrpcs.exe running and listening on port 4592, the system is affected by this vulnerability since all versions are impacted and no authentication is required for exploitation.
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-supplied patch for WebAccess or upgrade to a patched version; if immediate patching is not feasible, restrict network access to port 4592 at the network perimeter to prevent external exploitation.
- Consultation3.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2011-4041 — 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-2011-4041 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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