CVE-2011-3321
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 · uneditedHeap-based buffer overflow in the Siemens WinCC Runtime Advanced Loader, as used in SIMATIC WinCC flexible Runtime and SIMATIC WinCC (TIA Portal) Runtime Advanced, allows remote attackers to cause a denial of service (memory corruption) or possibly execute arbitrary code via a crafted packet to TCP port 2308.
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 confidenceHeap-based buffer overflow in Siemens WinCC Runtime Advanced Loader (used in SIMATIC WinCC flexible Runtime and SIMATIC WinCC TIA Portal Runtime Advanced) allows remote attackers to send crafted packets to TCP port 2308, causing memory corruption or potentially executing arbitrary 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 dataall versionsall 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
- M
- Authentication
- None
- Confidentiality
- Complete
- Integrity
- Complete
- Availability
- Complete
AV:N/AC:M/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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Verify if WinCC Runtime software is installedOpen Windows Control Panel > Programs and Features, or run 'Get-ItemProperty HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\* | Select-Object DisplayName' in PowerShell, and look for entries containing 'WinCC', 'WinCC flexible', or 'SIMATIC'Affected if Any WinCC Runtime, WinCC Flexible Runtime, or SIMATIC WinCC TIA Portal Runtime Advanced software appears in the installed programs list
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Identify WinCC Runtime processesOpen Task Manager or run 'Get-Process' in PowerShell and look for processes such as 'WinCC Runtime Advanced Loader', 'smi_runtime', or processes with 'WinCC' in the nameAffected if Any WinCC Runtime-related process is running on the system
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Check if TCP port 2308 is listeningRun 'netstat -an | findstr :2308' or 'Get-NetTCPConnection -LocalPort 2308' in PowerShell to see if port 2308 is bound to a listening stateAffected if TCP port 2308 shows a LISTENING state, indicating the vulnerable service is active
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Verify network exposure of port 2308Run 'netsh advfirewall firewall show rule name=all' or check firewall rules to determine if TCP port 2308 is allowed through the Windows Firewall for inbound connectionsAffected if Port 2308 is permitted in firewall rules for inbound traffic, making it reachable from the network
A system is affected if it has any WinCC Runtime or WinCC Flexible Runtime installed AND TCP port 2308 is open and reachable on the network.
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 TCP port 2308 and apply vendor patches or updates to the WinCC Runtime Advanced software. Consider network segmentation for industrial control systems.
- Consultation8.0 h
- Implementation16.0 h
- Testing12.0 h
- Review / QA8.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $12,352.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2011-3321 — 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-2011-3321 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
- No spam, self-promotion, credentials, or personal data