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Siprotec FirmwareOperating system · Siemens

CVE-2016-4785

MEDIUM · 5.3 CVSS v3.0 Published 2016-05-31
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
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 Firmware variant PROFINET IO for EN100 Ethernet module : All versions < V1.04.01; Firmware variant Modbus TCP for EN100 Ethernet module : All versions < V1.11.00; Firmware variant DNP3 TCP for EN100 Ethernet module : All versions < V1.03; Firmware variant IEC 104 for EN100 Ethernet module : All versions < V1.21; EN100 Ethernet module included in SIPROTEC Merging Unit 6MU80 : All versions < 1.02.02. The integrated web server (port 80/tcp) of the affected devices could allow remote attackers to obtain a limited amount of device memory content if network access was obtained. This vulnerability only affects EN100 Ethernet module included in SIPROTEC4 and SIPROTEC Compact devices.

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 (port 80/tcp) contains an information disclosure vulnerability allowing remote attackers with network access to read limited device memory content. This affects multiple firmware variants (PROFINET IO < V1.04.01, Modbus TCP < V1.11.00, DNP3 TCP < V1.03, IEC 104 < V1.21) in SIPROTEC4 and SIPROTEC Compact protection devices.

MitigationUpdate affected EN100 Ethernet module firmware to the specified minimum versions; if updates are not feasible, restrict network access to port 80/tcp via firewall or network segmentation and disable the web server if not operationally 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
Siprotec FirmwareOperating system
Affected:= 4.26all 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:3.0/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 SIPROTEC device and EN100 module
    Confirm the target device is a Siemens SIPROTEC4 or SIPROTEC Compact protection device with an EN100 Ethernet module. Check device documentation, inventory records, or network discovery for the EN100 module presence.
    Affected if Device is a SIPROTEC4 or SIPROTEC Compact with an EN100 Ethernet module installed
  2. Verify web server is accessible on port 80
    Test TCP port 80 connectivity to the EN100 module's IP address using a network scan tool (such as netcat or nmap) or attempt an HTTP request. Confirm the integrated web server is responding.
    Affected if Port 80/tcp is open and the EN100 web server is accessible
  3. Check PROFINET IO firmware version
    Access the EN100 module web interface or management console to retrieve the PROFINET IO firmware version. Compare the installed version against the affected range: versions below V1.04.01.
    Affected if PROFINET IO firmware version is below V1.04.01
  4. Check Modbus TCP firmware version
    Access the EN100 module web interface or management console to retrieve the Modbus TCP firmware version. Compare the installed version against the affected range: versions below V1.11.00.
    Affected if Modbus TCP firmware version is below V1.11.00
  5. Check DNP3 TCP firmware version
    Access the EN100 module web interface or management console to retrieve the DNP3 TCP firmware version. Compare the installed version against the affected range: versions below V1.03.
    Affected if DNP3 TCP firmware version is below V1.03
  6. Check IEC 104 firmware version
    Access the EN100 module web interface or management console to retrieve the IEC 104 firmware version. Compare the installed version against the affected range: versions below V1.21.
    Affected if IEC 104 firmware version is below V1.21

The environment is affected if the EN100 module web server on port 80 is accessible and any of the installed protocol firmware variants (PROFINET IO, Modbus TCP, DNP3 TCP, or IEC 104) falls below its respective minimum version threshold.

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
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Update affected EN100 Ethernet module firmware to the specified minimum versions; if updates are not feasible, restrict network access to port 80/tcp via firewall or network segmentation and disable the web server if not operationally required.

Fix this in Siprotec Firmware 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-2016-4785 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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