CVE-2018-13807
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 SCALANCE X300 (All versions < V4.0.0), SCALANCE X408 (All versions < V4.0.0), SCALANCE X414 (All versions). The web interface on port 443/tcp could allow an attacker to cause a Denial-of-Service condition by sending specially crafted packets to the web server. The device will automatically reboot, impacting network availability for other devices. An attacker must have network access to port 443/tcp to exploit the vulnerability. Neither valid credentials nor interaction by a legitimate user is required to exploit the vulnerability. There is no confidentiality or integrity impact, only availability is temporarily impacted. This vulnerability could be triggered by publicly available tools.
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 confidenceA denial-of-service vulnerability in the web interface (port 443/tcp) of Siemens SCALANCE X300, X408, and X414 industrial network switches allows an unauthenticated remote attacker to cause device reboot by sending specially crafted packets, impacting network availability.
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< 4.0.0< 4.0.0all versionsCVSS 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
- Changed
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/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 the SCALANCE device modelAccess the device web interface or use SNMP to query the device sysDescr. Alternatively, check the physical device label or management interface for the exact model number (X300, X408, or X414).Affected if The device is a SCALANCE X300, X408, or X414 model.
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Determine the firmware versionLog into the web interface and navigate to System > Information > Firmware Version, or use the command-line interface and run the 'show firmware version' or equivalent command.Affected if The installed firmware version is less than 4.0.0 for X300 or X408, or any version for X414.
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Verify the web interface is enabledCheck the device configuration for HTTP/HTTPS web server settings. This is typically found under 'HTTP' or 'Web Based Management' in the device settings. Confirm port 443 is listening by attempting a connection or using a network scanner.Affected if The web interface on port 443/tcp is enabled and accessible.
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Assess network exposure of port 443Review firewall rules, VLAN configuration, or network segmentation to determine if port 443/tcp on the SCALANCE device is reachable from untrusted networks or the internet.Affected if Port 443/tcp is exposed to untrusted networks or attacker-accessible locations.
A user is affected if they have a SCALANCE X300 or X408 with firmware below V4.0.0, or any X414 model, with the web interface on port 443 enabled and accessible from the network where an attacker could send malicious packets.
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 data4.0.0
Upgrade SCALANCE X300/X408 firmware to V4.0.0 or later (X414 has no fix available); as interim measure, restrict network access to port 443/tcp via firewall or VLAN segmentation.
- Consultation6.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2018-13807 — 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-2018-13807 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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- 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
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