CVE-2018-7850
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 CWE-807: Reliance on Untrusted Inputs in a Security Decision vulnerability exists in all versions of the Modicon M580, Modicon M340, Modicon Quantum, and Modicon Premium which could cause invalid information displayed in Unity Pro software.
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 CWE-807 (Reliance on Untrusted Inputs in a Security Decision) vulnerability in all versions of Modicon M580, M340, Quantum, and Premium PLCs allows the devices to process untrusted inputs without proper validation, which can cause invalid or manipulated information to be displayed in the Unity Pro engineering software. This is an information integrity issue where operator displays may show incorrect data.
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 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
- Low
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
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 Modicon PLC models in the environmentInventory all PLCs and confirm the presence of Modicon M580, M340, Quantum, or Premium models by reviewing network diagrams, asset inventories, or querying the engineering workstation for connected devicesAffected if Any Modicon M580, M340, Quantum, or Premium PLC is present in the environment
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Confirm firmware version of affected PLCsUse Unity Pro engineering software or the PLC programming tool to query the firmware version from each Modicon M580, M340, Quantum, or Premium PLCAffected if The PLC is a Modicon M580, M340, Quantum, or Premium with any firmware version (all versions are affected)
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Review network segmentation for PLCsExamine the network architecture to determine whether the Modicon PLCs are isolated on a dedicated control network or if they are accessible from untrusted business/IT networksAffected if The PLCs are connected to networks that include untrusted or non-control system segments
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Inspect Unity Pro communication pathCheck the configuration of Unity Pro engineering software and identify how it connects to the PLCs (protocol, authentication, and whether it traverses untrusted network segments)Affected if Unity Pro communicates with the PLCs over paths that cross untrusted networks without validation controls
If your environment contains any Modicon M580, M340, Quantum, or Premium PLCs receiving unvalidated inputs from untrusted network sources, the displayed data in Unity Pro may be manipulated.
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 dataImplement network segmentation to isolate PLCs from untrusted networks; coordinate with Schneider Electric for firmware updates if available; implement compensating controls such as data validation and anomaly detection at the engineering station level.
- Consultation6.0 h
- Implementation12.0 h
- Testing8.0 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 $8,448.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-7850 — 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-2018-7850 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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