CVE-2012-0929
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 · uneditedMultiple buffer overflows in Schneider Electric Modicon Quantum PLC allow remote attackers to cause a denial of service via malformed requests to the (1) FTP server or (2) HTTP server.
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 confidenceMultiple buffer overflow vulnerabilities exist in the FTP and HTTP server components of Schneider Electric Modicon Quantum PLCs. Remote attackers can exploit these by sending malformed requests to either service, causing a denial of service condition.
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
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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 the PLC modelQuery the PLC for its model and firmware version using the appropriate programming tool (e.g., Unity Pro, Concept) or check the physical hardware labelingAffected if The device is not a Schneider Electric Modicon Quantum PLC
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Confirm FTP service statusUse network scanning tools (e.g., nmap) or check PLC configuration to determine if the FTP server is enabled and listening on the PLCAffected if FTP server is enabled and accessible on the network
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Confirm HTTP service statusAccess the PLC's web interface via browser or use network scanning tools (e.g., nmap) to check if HTTP service is enabled and listeningAffected if HTTP server is enabled and accessible on the network
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Check network exposureReview firewall rules, network segmentation, and ACLs to determine if the PLC's FTP and HTTP ports are accessible from untrusted networksAffected if FTP or HTTP services are reachable from external or untrusted network segments
The environment is affected if the device is a Schneider Electric Modicon Quantum PLC with FTP or HTTP services enabled and network-accessible, since all versions contain the vulnerable components.
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 the PLC's FTP and HTTP services using firewalls or network segmentation to prevent unauthorized external access, and apply any vendor-supplied patches for the Modicon Quantum firmware.
- Consultation3.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2012-0929 — 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-2012-0929 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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