CVE-2012-3017
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 · uneditedSiemens SIMATIC S7-400 PN CPU devices with firmware 5.x allow remote attackers to cause a denial of service (defect-mode transition and service outage) via (1) malformed HTTP traffic or (2) malformed IP packets.
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 confidenceSiemens SIMATIC S7-400 PN CPU devices with firmware version 5.x are vulnerable to remote denial of service attacks. Attackers can send malformed HTTP traffic or malformed IP packets to trigger a defect-mode transition, causing service outage.
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= 5.0all versionsall 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
- 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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Identify the device modelLocate the CPU model number on the physical device or in the device configuration. Confirm it is one of: S7-400 CPU 414-3 Pn/dp, S7-400 CPU 416-3 Pn/dp, or S7-400 CPU 416f-3 Pn/dp.Affected if The device is any of these three models.
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Check the firmware versionAccess the device via STEP 7/TIA Portal, the device's web interface, or the PLC hardware diagnostic display. Locate the firmware version information.Affected if The firmware version is 5.0 or any other version in the 5.x branch.
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Verify network exposureDetermine if the device is directly reachable on the network. Check if IP communications are enabled and the device has an assigned IP address on a routable network segment.Affected if The device is network-accessible and can receive incoming IP packets or HTTP requests from untrusted sources.
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Confirm enabled servicesReview the device configuration to determine if HTTP/HTTPS web server features or other IP-based communication services are enabled on the CPU.Affected if HTTP or other IP-based services are enabled, as these are the vectors for malformed packet delivery.
A user is affected if they have a S7-400 CPU 414/416/416f-3 Pn/dp device running firmware version 5.x that is network-accessible with IP or HTTP services enabled.
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 firmware to a patched version beyond 5.x. Implement network segmentation and ingress filtering to block malformed packets reaching affected devices.
- Consultation6.0 h
- Implementation12.0 h
- Testing6.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $7,968.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2012-3017 — 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-2012-3017 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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