CVE-2019-18269
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 · uneditedOmron’s CS and CJ series PLCs have an unrestricted externally accessible lock vulnerability.
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 confidenceOmron CS and CJ series PLCs contain an unrestricted externally accessible lock vulnerability, allowing unauthorized external access to the lock mechanism without proper authentication or access controls. This critical flaw in industrial control devices could permit attackers to bypass security controls and potentially manipulate PLC operations.
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 CS/CJ PLCs on the networkScan your network for devices with Omron vendor identifiers or perform a banner grab on port 9600 (common Omron PLC port) to identify CS or CJ series units. Check your asset inventory for Omron CS or CJ model numbers.Affected if Omron CS or CJ series PLCs are present on the network
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Check network accessibility of the PLC lock interfaceDetermine if the PLC is reachable from network segments outside the local control network. Use nmap or network scanning tools to test connectivity to PLC ports, particularly the FINS protocol port (9600/UDP). Review firewall rules and ACLs controlling access to the PLC IP address.Affected if The PLC is accessible from untrusted network segments without firewall filtering
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Verify authentication requirements for lock operationsConsult the PLC programming software (CX-Programmer or Sysmac Studio) configuration. Check if the PLC lock mechanism (which controls write access to the CPU unit) has any password or authentication protection configured. Review the PLC security settings in the unit setup.Affected if No password or authentication is configured for the lock mechanism protecting CPU write access
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Confirm network segmentation controlsReview network diagrams and VLAN configurations to verify that the PLC is placed in an isolated industrial DMZ or control network segment. Check that routing or ACLs prevent direct access from enterprise or external networks.Affected if The PLC is not isolated in a dedicated control network segment and is reachable from broader network infrastructure
You are affected if you have Omron CS or CJ series PLCs exposed to network segments without proper authentication on the lock mechanism or network segmentation controls.
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 PLCs through network segmentation and firewall rules; contact Omron for firmware updates or patches that address the lock vulnerability; implement compensating controls such as monitoring and physical access restrictions.
- Consultation8.0 h
- Implementation16.0 h
- Testing12.0 h
- Review / QA8.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2019-18269 — 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-2019-18269 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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