CVE-2019-19279
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 SIPROTEC 4 and SIPROTEC Compact relays equipped with EN100 Ethernet communication modules (All versions). Specially crafted packets sent to port 50000/UDP of the EN100 Ethernet communication modules could cause a Denial-of-Service of the affected device. A manual reboot is required to recover the service of the device. At the time of advisory publication no public exploitation of this security vulnerability was known to Siemens.
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 Denial-of-Service vulnerability exists in SIPROTEC 4 and SIPROTEC Compact relays with EN100 Ethernet communication modules. Attackers can send specially crafted UDP packets to port 50000, causing the device to become unresponsive and requiring a manual reboot to restore service.
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 dataall versionsall 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
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/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 SIPROTEC devices on the networkScan the network for devices with product identifiers containing 'SIPROTEC 4' or 'SIPROTEC Compact' or conduct an inventory of industrial control devices. Check device nameplates, management interfaces, or PLC/SCADA system documentation for these product names.Affected if Any SIPROTEC 4 or SIPROTEC Compact relay devices are present in the environment
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Confirm EN100 module presenceAccess the web-based or management interface of the SIPROTEC device and navigate to the communication module configuration. Look for 'EN100' or 'EN100 Ethernet' module listed in the hardware or module status.Affected if An EN100 Ethernet communication module is installed or configured on the device
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Verify UDP port 50000 exposurePerform a network port scan targeting the SIPROTEC devices for UDP port 50000, or review firewall and network segmentation configurations to determine if port 50000/UDP is open to untrusted networks.Affected if Port 50000/UDP is reachable from any network segment that contains untrusted or external systems
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Check network access controlsReview firewall rules, ACLs, or network segmentation policies that govern traffic to the SIPROTEC devices. Verify whether port 50000/UDP traffic is restricted to authorized management stations or trusted networks only.Affected if Port 50000/UDP has no firewall restrictions or is accessible from less trusted network zones
If any SIPROTEC 4 or SIPROTEC Compact device with an EN100 module exists and port 50000/UDP is accessible from an untrusted network segment, the environment is affected by this CVE.
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 dataApply network segmentation and firewall rules to restrict unauthorized access to port 50000/UDP. Contact Siemens for firmware updates to address this vulnerability in EN100 modules.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,600.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-19279 — 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-2019-19279 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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