CVE-2016-7113
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 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. Specially crafted packets sent to port 80/tcp could cause the affected device to go into defect mode.
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 vulnerability in Siemens EN100 Ethernet module firmware allows specially crafted packets sent to port 80/tcp (HTTP) to trigger a denial of service condition, causing the device to enter defect mode. This affects multiple protocol variants (PROFINET IO, Modbus TCP, DNP3 TCP, IEC 104) across multiple firmware versions.
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= 4.28CVSS 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:3.0/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 Siemens EN100 Ethernet module on the networkCheck network inventory or scan for devices responding to HTTP on port 80/tcp with Siemens vendor fingerprint or specific HTTP server headers. Document the IP address and hostname of the device.Affected if The device is a Siemens EN100 Ethernet module with port 80/tcp accessible.
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Determine firmware version of the EN100 moduleAccess the device web interface via HTTP on port 80/tcp and navigate to the firmware version information page, typically found under 'Device Info' or 'Status' sections. Alternatively, use SNMP or the device configuration tool to query the firmware version.Affected if The installed firmware version is exactly 4.28.
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Confirm protocol variant in useCheck the device configuration or documentation to identify which protocol variant is enabled: PROFINET IO, Modbus TCP, DNP3 TCP, or IEC 104.Affected if Any of these four protocol variants are configured and the firmware is version 4.28.
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Verify port 80/tcp accessibilityPerform a TCP port scan targeting port 80/tcp on the EN100 device IP address using nmap or similar tool: nmap -p 80 <device_ip>.Affected if Port 80/tcp is open and reachable from the network segment being assessed.
The environment is affected if a Siemens EN100 Ethernet module with firmware version 4.28 has port 80/tcp accessible on the network, regardless of which protocol variant (PROFINET IO, Modbus TCP, DNP3 TCP, IEC 104) is configured.
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 dataUpdate firmware to versions V1.04.01 (PROFINET), V1.11.00 (Modbus TCP), V1.03 (DNP3 TCP), V1.21 (IEC 104), or 1.02.02 (6MU80) respectively. Network segmentation to restrict access to port 80/tcp on affected devices provides a compensating control.
- Consultation8.0 h
- Implementation4.0 h
- Testing6.0 h
- Review / QA4.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2016-7113 — 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-2016-7113 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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