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En100 Ethernet Module With Firmware Variant Dnp3 TcpOperating system · Siemens

CVE-2019-13943

MEDIUM · 6.1 CVSS v3.1 Published 2019-12-12
Fix available
A fix is available. Upgrade to 4.37 or later.
See remediation →
68/100
Remediation priority · Elevated
Remotely reachable No privileges

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). The web interface could allow Cross-Site Scripting (XSS) attacks if an attacker is able to modify content of particular web pages, causing the application to behave in unexpected ways for legitimate users. Successful exploitation does not require for an attacker to be authenticated to the web interface. This could allow the attacker to read or modify contents of the web application. 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

Cross-Site Scripting (XSS) vulnerability in the web interface of ABB EN100 Ethernet module multiple variants (DNP3, IEC 61850, IEC104, Modbus TCP, PROFINET IO). The vulnerability allows unauthenticated attackers to inject malicious scripts into web pages, potentially reading or modifying web application contents.

MitigationApply vendor firmware updates (IEC 61850 variant requires V4.37 or later); for other variants, contact ABB for patch availability. Implement network segmentation to limit web interface exposure.

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
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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. Confirm EN100 web interface is enabled
    Access the EN100 module's IP address via HTTP/HTTPS in a web browser. If a login page or web configuration panel loads, the web interface is enabled.
    Affected if The web interface is accessible and the module uses one of the affected firmware variants (DNP3 TCP, IEC 61850, IEC104, Modbus TCP, PROFINET IO).
  2. Identify the firmware variant
    Locate the product model number or firmware variant information in the web interface (usually under Device Info, Status, or System Information pages) or check the physical device label. Variants include: DNP3 TCP, IEC 61850, IEC104, Modbus TCP, PROFINET IO.
    Affected if The device is any EN100 variant other than IEC 61850 (see next step for that exception).
  3. Check firmware version for IEC 61850 variant
    In the web interface, navigate to the firmware version or software version field (typically found under System, Status, or About sections). Compare the displayed version number to the affected range.
    Affected if The firmware version is lower than 4.37 (e.g., 4.36, 4.35, etc.).
  4. Check firmware version for non-IEC 61850 variants
    In the web interface, locate the firmware or software version information (usually under Device Information, Status, or Help pages).
    Affected if The device runs DNP3 TCP, IEC104, Modbus TCP, or PROFINET IO variant at any version (all versions are affected).
  5. Verify network exposure of the web interface
    Check if the EN100 web interface IP is accessible from untrusted networks by reviewing network firewall rules or performing a port scan (ports 80/443) from an external system.
    Affected if The web interface is exposed to untrusted networks without segmentation, allowing unauthenticated attackers to reach the XSS payload.

The environment is affected if an EN100 Ethernet module with an affected variant (DNP3 TCP, IEC 61850 < 4.37, IEC104, Modbus TCP, or PROFINET IO) has its web interface enabled and reachable.

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 later); for other variants, contact ABB for patch availability. Implement network segmentation to limit web interface exposure.

Fix this in En100 Ethernet Module With Firmware Variant Dnp3 Tcp Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing8.0 h
  • Review / QA4.0 h
24.0 hours of engineering $4,160
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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-2019-13943 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