CVE-2011-2956
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 · uneditedAzeoTech DAQFactory before 5.85 (Build 1842) does not perform authentication for certain signals, which allows remote attackers to cause a denial of service (system reboot or shutdown) via a signal.
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 confidenceAzeoTech DAQFactory SCADA/HMI software before version 5.85 (Build 1842) lacks authentication checks for certain system signals, allowing unauthenticated remote attackers to send specially crafted signals that trigger immediate system reboot or shutdown, resulting in denial of service.
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<= 5.84= 3.0= 3.03= 3.5= 3.05= 3.09= 3.10= 3.11= 3.51= 3.52= 3.53= 3.55CVSS 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
- None
- Integrity
- None
- Availability
- Complete
AV:N/AC:L/Au:N/C:N/I:N/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 DAQFactory installationCheck for DAQFactory installation by looking in Program Files for 'AzeoTech' folder, or check Windows Registry under HKLM\Software\AzeoTech or HKLM\Software\Wow6432Node\AzeoTech for the product entryAffected if DAQFactory is not found on the system - not affected. If found, proceed to version check.
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Identify installed DAQFactory versionOpen DAQFactory and navigate to Help > About, or check the Windows Registry value 'Version' under the AzeoTech registry key, or examine the file properties of the main executable (typically at C:\Program Files\AzeoTech\DAQFactory\DAQFactory.exe)Affected if Version is below 5.85 or version matches any of these: 3.0, 3.03, 3.5, 3.05, 3.09, 3.10, 3.11, 3.51, 3.52, 3.53, 3.55 - system is affected
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Confirm build numberIn DAQFactory About window or registry under 'Build' value, verify if build number is below 1842Affected if Build number is 1841 or lower - system is affected
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Assess network exposure of DAQFactory serviceCheck if DAQFactory ports (default: 20034 for the SCADA server) are listening on external interfaces using 'netstat -an' or by reviewing firewall rulesAffected if DAQFactory service port is bound to 0.0.0.0 or an external IP address rather than localhost only - vulnerability is remotely exploitable
If DAQFactory is installed with version below 5.85 (Build 1842) or matching any affected version listed, and the service port is network-accessible, the system is affected by this CVE.
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 DAQFactory to version 5.85 (Build 1842) or later. If immediate upgrade is not feasible, implement network segmentation and firewall controls to restrict unauthorized external access to the DAQFactory service ports.
- Consultation6.0 h
- Implementation4.0 h
- Testing12.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2011-2956 — 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-2011-2956 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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