CVE-2018-7762
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 · uneditedA vulnerability exists in the web services to process SOAP requests in Schneider Electric's Modicon M340, Modicon Premium, Modicon Quantum PLC, BMXNOR0200 which could allow result in a buffer overflow.
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 confidenceA buffer overflow vulnerability exists in the web services component that processes SOAP requests on Schneider Electric Modicon M340, Modicon Premium, Modicon Quantum PLCs and BMXNOR0200 devices. The vulnerability allows remote attackers to potentially execute arbitrary code or cause a denial of service via specially crafted SOAP requests to the web interface.
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 versionsall versionsall versionsall versionsall 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
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.0/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 device modelAccess the PLC or network module and retrieve the exact model number from the device diagnostics, web interface, or management console. Look for model identifiers: BMXNOR0200, BMXNOR0200H, 140cpu65150, 140cpu31110, 140cpu43412u, 140cpu65160, 140cpu65260, or 140cpu65860.Affected if The device model matches any of the listed affected models.
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Confirm web services are enabledCheck the device configuration or web interface to determine if the embedded web server (HTTP/HTTPS service) is enabled. On Modicon PLCs and BMXNOR0200, this is typically configured in the device network settings or Unity Pro/SoMachine programming software.Affected if Web services are enabled on the device.
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Verify web interface accessibilityDetermine if the device web interface port (default HTTP port 80 or HTTPS port 443) is listening and accessible from network segments outside the local engineering workstation. Use network scanning tools or check firewall rules.Affected if The web interface is reachable from untrusted network segments.
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Check for anomalous SOAP trafficCapture and inspect network traffic to the device web services port for SOAP request patterns. Look for unusually large or malformed SOAP envelopes that may indicate exploitation attempts.Affected if SOAP requests to the web interface are observed, particularly with abnormal sizes or structures.
If the device is one of the listed affected models and has its web services enabled and accessible, the environment is potentially affected by this vulnerability.
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 dataApply vendor-supplied firmware updates/patches for the affected Modicon PLCs and BMXNOR0200 devices. Until patches are available, restrict network access to the web services port and monitor for anomalous SOAP requests.
- Consultation8.0 h
- Implementation16.0 h
- Testing24.0 h
- Review / QA8.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-7762 — 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-2018-7762 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
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