CVE-2019-18259
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 · uneditedIn Omron PLC CJ series, all versions and Omron PLC CS series, all versions, an attacker could spoof arbitrary messages or execute commands.
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 critical vulnerability exists in the Omron CJ and CS series PLCs where an attacker on the network can spoof arbitrary messages or execute commands, likely due to missing authentication or message validation in the PLC communication protocol. The CVSS 9.8 indicates this is remotely exploitable with no user interaction required.
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 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
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 Omron CJ or CS series PLCs on the networkScan the network for devices with Omron-specific vendor identifiers or check PLC hardware models directly. Use network scanning tools or consult asset inventories to locate devices with model numbers starting with CJ or CS.Affected if Any Omron CJ or CS series PLC is present on the network
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Verify PLC firmware versionAccess the PLC via its programming software (such as CX-Programmer) or check the device directly to confirm the firmware version is any version.Affected if Firmware version is any version (all versions are affected)
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Check if PLC communication ports are network-accessibleScan for open ports commonly used by Omron PLCs (typically UDP port 9600 for FINS protocol). Use network scanning tools to determine if these ports respond to external network requests.Affected if The PLC protocol ports (e.g., UDP 9600) are exposed to untrusted networks or accessible from beyond the local control system segment
If Omron CJ or CS series PLCs exist with their PLC protocol ports accessible from the network, the environment is 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 dataIsolate PLCs behind industrial firewalls or network segmentation; restrict network access to trusted sources only; implement DMZ architectures for SCADA/ICS environments.
- Consultation8.0 h
- Implementation16.0 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 $10,240.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-18259 — 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-2019-18259 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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