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En100 Ethernet Module With Firmware Variant Dnp3 TcpOperating system · Siemens

CVE-2019-13944

MEDIUM · 5.3 CVSS v3.1 Published 2019-12-12
Fix available
A fix is available. Upgrade to 4.37 or later.
See remediation →
62/100
Remediation priority · Elevated
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 vulnerability has been identified in EN100 Ethernet module DNP3 variant (All versions), EN100 Ethernet module IEC 61850 variant (All versions < V4.37), EN100 Ethernet module IEC104 variant (All versions), EN100 Ethernet module Modbus TCP variant (All versions), EN100 Ethernet module PROFINET IO variant (All versions). A vulnerability in the integrated web server of the affected devices could allow unauthorized attackers to obtain sensitive information about the device, including logs and configurations. At the time of advisory publication no public exploitation of this security vulnerability was known.

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 · high confidence

The EN100 Ethernet module's integrated web server contains an information disclosure vulnerability across multiple protocol variants (DNP3, IEC 61850, IEC104, Modbus TCP, PROFINET IO). Unauthorized attackers can remotely obtain sensitive device information including logs and configuration data without authentication, due to improper access controls on the web server interface.

MitigationApply vendor firmware updates (IEC 61850 variant requires V4.37 or higher) and implement network segmentation to restrict web server access to authorized management networks only.

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
En100 Ethernet Module With Firmware Variant Dnp3 TcpOperating system
Affected:all versions
En100 Ethernet Module With Firmware Variant Iec 61850Operating system
Affected:< 4.37
En100 Ethernet Module With Firmware Variant Iec104Operating system
Affected:all versions
En100 Ethernet Module With Firmware Variant Modbus TcpOperating system
Affected:all versions
En100 Ethernet Module With Firmware Variant Profinet IoOperating system
Affected:all versions

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
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 checks

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

  1. Identify EN100 Ethernet module in your environment
    Locate Siemens EN100 Ethernet modules on the network by scanning for the device or reviewing asset inventory. These are industrial Ethernet communication modules used for protocol conversion.
    Affected if The device is present and runs any of the affected firmware variants (DNP3 TCP, IEC 61850, IEC104, Modbus TCP, Profinet IO).
  2. Determine the firmware variant
    Access the device web interface or check device configuration to identify which protocol variant is installed: DNP3 TCP, IEC 61850, IEC104, Modbus TCP, or Profinet IO.
    Affected if Any variant is installed - four of the five variants are affected in all versions.
  3. Check firmware version for IEC 61850 variant
    If the IEC 61850 variant is installed, access the device web interface or use the device management interface to view the firmware version information.
    Affected if The firmware version is lower than 4.37 (versions < 4.37 are affected).
  4. Verify web server accessibility
    Attempt to access the device web interface over HTTP/HTTPS from an unauthorized network segment or test if the web server responds to requests without authentication.
    Affected if The web server interface is accessible from network segments that should not have management access - this exposure enables the vulnerability.
  5. Test for unauthenticated information access
    Attempt to access common web paths on the device (such as logs, configuration pages, or status endpoints) without providing credentials to confirm whether the web server allows unauthenticated access.
    Affected if Sensitive information (logs, configuration data) is accessible without authentication - this confirms the vulnerability is present.

You are affected if you have an EN100 Ethernet module with any firmware variant, especially IEC 61850 versions below 4.37, and the web server interface is accessible from your network without authentication controls.

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.

From vendor data
Upgrade available Upgrade to 4.37 or later
Fixed in 4.37
Interim mitigation

Apply vendor firmware updates (IEC 61850 variant requires V4.37 or higher) and implement network segmentation to restrict web server access to authorized management networks only.

Fix this in En100 Ethernet Module With Firmware Variant Dnp3 Tcp Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA2.0 h
20.0 hours of engineering $3,500
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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-2019-13944 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