CVE-2011-4534
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 · uneditedZenSysSrv.exe in Ing. Punzenberger COPA-DATA zenon 6.51 SP0 allows remote attackers to cause a denial of service (service crash) or possibly execute arbitrary code via a series of connections and disconnections on TCP port 1101, aka Reference Number 25212.
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 confidenceThe ZenSysSrv.exe service in COPA-DATA zenon 6.51 SP0 contains a vulnerability on TCP port 1101 where rapid series of connection and disconnection attempts can trigger a denial of service or potentially allow arbitrary code execution due to improper handling of connection state.
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= 6.51CVSS 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
- Partial
- Integrity
- Partial
- Availability
- Partial
AV:N/AC:L/Au:N/C:P/I:P/A:P
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 if zenon software is installedCheck for the presence of COPA-DATA zenon installation directory, typically in Program Files or Program Files (x86). Look for zenon-related folders or check Windows Registry under HKLM\SOFTWARE\COPA-DATA or HKLM\SOFTWARE\WOW6432Node\COPA-DATA for zenon entries.Affected if zenon software is found on the system
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Determine installed zenon versionCheck the zenon version information. Look for version 6.51 specifically. Check the zenon installation directory for version files, or right-click on zenon executable files to view Properties > Details for version information.Affected if installed version equals 6.51
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Check if ZenSysSrv.exe service exists and is runningOpen Windows Services console (services.msc) and look for a service named ZenSysSrv, or check Task Manager for a process named ZenSysSrv.exe. Also check the zenon installation directory for the presence of ZenSysSrv.exe.Affected if ZenSysSrv.exe service exists and is running on the system
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Verify TCP port 1101 is listeningOpen Command Prompt and run 'netstat -an | findstr :1101' or use PowerShell 'Get-NetTCPConnection -LocalPort 1101' to check if port 1101 is in LISTENING state.Affected if port 1101 is open and listening
A system is affected if it runs COPA-DATA zenon version 6.51 with the ZenSysSrv.exe service running and port 1101 exposed.
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 dataRestrict network access to port 1101 using firewall rules or network segmentation, and upgrade to a patched version of zenon software.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2011-4534 — 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-2011-4534 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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