CVE-2019-6813
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-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in BMXNOR0200H Ethernet / Serial RTU module (all firmware versions) and Modicon M340 controller (all firmware versions), which could cause denial of service when truncated SNMP packets on port 161/UDP are received by the device.
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-754 Improper Check for Unusual or Exceptional Conditions vulnerability exists in Schneider Electric's BMXNOR0200H Ethernet/Serial RTU module and Modicon M340 controller. The SNMP service (port 161/UDP) fails to properly handle truncated SNMP packets, causing a denial of service condition. All firmware versions are affected.
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
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/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 modelQuery the device via SNMP sysDescr, check the web interface, or review network documentation to confirm the device is a Schneider Electric Modicon M340 controller or BMXNOR0200H Ethernet/Serial RTU module.Affected if The device is a Modicon M340 or BMXNOR0200H
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Verify SNMP service is enabledSend an SNMP request to port 161/UDP or check the device configuration to confirm SNMP service is running. Use a tool like snmpwalk or nmap -sU -p 161 to probe the service.Affected if SNMP service is responding on UDP port 161
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Confirm network accessibility of SNMPReview firewall rules, network segmentation, and ACLs to determine if port 161/UDP is reachable from network segments that could contain malicious actors.Affected if The SNMP service on port 161/UDP is accessible from untrusted or external network segments
If the device is a Schneider Electric Modicon M340 or BMXNOR0200H with SNMP enabled and network-accessible on port 161/UDP, it is affected by CVE-2019-6813.
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 affected devices and apply firewall rules to filter or block unexpected SNMP traffic on port 161/UDP. Contact Schneider Electric for available patches or firmware updates.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,600.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-6813 — 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-2019-6813 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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- Version or environment caveats, and links to real fixes
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