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Meg6501 0001 FirmwareOperating system · Schneider Electric

CVE-2019-6840

CRITICAL · 9.8 CVSS v3.1 Published 2019-09-17
Fix available
A fix is available. Upgrade to 1.3.7 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

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 · unedited
A Format String: CWE-134 vulnerability exists in U.motion Server (MEG6501-0001 - U.motion KNX server, MEG6501-0002 - U.motion KNX Server Plus, MEG6260-0410 - U.motion KNX Server Plus, Touch 10, MEG6260-0415 - U.motion KNX Server Plus, Touch 15), which could allow an attacker to send a crafted message to the target server, thereby causing arbitrary commands to be executed.

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 confidence

A format string vulnerability (CWE-134) exists in U.motion KNX Server products (MEG6501-0001, MEG6501-0002, MEG6260-0410, MEG6260-0415). An unauthenticated attacker can send a specially crafted message to the target server, exploiting improper use of user-supplied format strings to achieve arbitrary command execution.

MitigationApply vendor-supplied patches if available; otherwise, implement network segmentation and restrict access to the U.motion Server to trusted IPs only, or disable the service if not 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 data
Meg6501 0001 FirmwareOperating system
Affected:< 1.3.7
Meg6501 0002 FirmwareOperating system
Affected:< 1.3.7
Meg6260 0410 FirmwareOperating system
Affected:< 1.3.7
Meg6260 0415 FirmwareOperating system
Affected:< 1.3.7

CVSS 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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify the U.motion Server model
    Access the server's web interface or check device documentation to confirm the exact model number (MEG6501-0001, MEG6501-0002, MEG6260-0410, or MEG6260-0415)
    Affected if The model is any of the four affected models listed in the CVE
  2. Check the installed firmware version
    Log into the U.motion web interface or use the server's admin panel to view the firmware version. Compare it against the affected threshold of 1.3.7
    Affected if The firmware version is below 1.3.7 (e.g., 1.2.x, 1.3.0, etc.)
  3. Verify the KNX Server service is network-accessible
    Review firewall rules, network configuration, or perform a port scan to determine if the U.motion Server is reachable from untrusted networks
    Affected if The service is exposed to untrusted network segments or the internet without proper access controls

You are affected if your device is a MEG6501 or MEG6260 model running firmware version 1.3.6 or lower and the service is accessible to potential attackers.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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.

dbcve · scoped
Upgrade available Upgrade to 1.3.7 or later
Fixed in 1.3.7
Interim mitigation

Apply vendor-supplied patches if available; otherwise, implement network segmentation and restrict access to the U.motion Server to trusted IPs only, or disable the service if not required.

Recommended fix High confidence

Upgrade to U.motion Server firmware version 1.3.7 or later

  1. Identify the exact U.motion Server model (MEG6501-0001, MEG6501-0002, MEG6260-0410, or MEG6260-0415).
  2. Log in to the U.motion Server administrative web interface.
  3. Check the current firmware version; if it is below 1.3.7, plan to upgrade.
  4. Download the firmware version 1.3.7 (or newer) from the official Schneider Electric support site.
  5. Follow the vendor's firmware upgrade procedure, ensuring stable power during the update.
  6. After the upgrade completes, verify the firmware version is 1.3.7 or later.
  7. Confirm the vulnerability is mitigated by reviewing release notes or testing with a crafted message.
Caveat Review the release notes for any configuration or compatibility changes before upgrading

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Meg6501 0001 Firmware Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing4.0 h
  • Review / QA2.0 h
15.0 hours of engineering $2,640
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2019-6840 in production — separate from our analysis above.

No notes yet

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What this is

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.

What belongs here
  • 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
  • No spam, self-promotion, credentials, or personal data