CVE-2019-13921
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 SIMATIC WinAC RTX (F) 2010 (All versions < SP3 Update 1). Affected versions of the software contain a vulnerability that could allow an unauthenticated attacker to trigger a denial-of-service condition. The vulnerability can be triggered if a large HTTP request is sent to the executing service. The security vulnerability could be exploited by an attacker with network access to the affected systems. Successful exploitation requires no system privileges and no user interaction. An attacker could use the vulnerability to compromise availability of the service provided by the software.
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 confidenceSIMATIC WinAC RTX (F) 2010 contains a vulnerability in its HTTP service component where processing a large HTTP request can cause the service to become unavailable. An unauthenticated attacker with network access can exploit this by sending oversized HTTP requests to trigger a denial-of-service condition without requiring any privileges or user interaction.
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 versions= sp1= sp2CVSS 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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Verify SIMATIC WinAC RTX (F) 2010 is installedCheck installed programs or look for Siemens SIMATIC WinAC RTX in the system. This may appear under Siemens Step 7 or in Windows Add/Remove Programs.Affected if The product SIMATIC WinAC RTX (F) 2010 is present on the system
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Identify the installed service pack versionCheck the version information of the SIMATIC WinAC RTX installation. This is typically found in the program properties, readme files, or via the SIMATIC software management interface.Affected if The installed version is SP1, SP2, or any version prior to SP3 Update 1
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Confirm the HTTP service component is presentCheck if the HTTP service component for WinAC RTX is installed. This is typically part of the standard installation but verify the HTTP server/service is among the enabled components.Affected if The HTTP service component is installed and enabled
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Determine network accessibility of the HTTP serviceVerify if the HTTP service port (default HTTP port 80 or configured port) is listening and accessible from the network. Use netstat or similar tools to check for listening HTTP ports.Affected if The HTTP service is listening on a network-accessible interface
A user is affected if SIMATIC WinAC RTX (F) 2010 with SP1 or SP2 (or earlier) is installed with the HTTP service enabled and exposed to the network.
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 dataUpgrade to SIMATIC WinAC RTX (F) 2010 SP3 Update 1 or later to obtain the patch. As an interim measure, restrict network access to the affected service using firewalls or network segmentation to prevent unauthorized HTTP requests.
- Consultation3.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2019-13921 — 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-2019-13921 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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