CVE-2020-7584
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 S7-200 SMART CPU family (All versions >= V2.2 < V2.5.1). Affected devices do not properly handle large numbers of new incomming connections and could crash under certain circumstances. An attacker may leverage this to cause a Denial-of-Service situation.
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 vulnerability in SIMATIC S7-200 SMART CPU family (versions V2.2 through V2.5.0) allows attackers to crash affected devices by sending large numbers of new incoming connections. The devices fail to properly handle connection exhaustion, leading to denial-of-service conditions.
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>= 2.2, < 2.5.1>= 2.2, < 2.5.1CVSS 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 the device modelConfirm the PLC is a Siemens Simatic S7-200 SMART series (either SR or ST CPU variant). This can be verified through the device labeling, TIA Portal project, or device web interface if available.Affected if The device is any Simatic S7-200 SMART SR or ST CPU model.
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Retrieve the firmware versionAccess the device firmware version through Siemens TIA Portal by connecting to the PLC and viewing the online diagnostics, or check the device web interface under system information if web server is enabled.Affected if Unable to retrieve a firmware version for comparison.
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Compare version against affected rangeDetermine if the installed firmware version is greater than or equal to V2.2 and less than V2.5.1. The exact version number is displayed in the diagnostics or system info screen.Affected if The installed version is >= 2.2 and < 2.5.1, meaning the device is within the vulnerable version range.
You are affected if your Simatic S7-200 SMART CPU (SR or ST) runs firmware version 2.2, 2.3, 2.4, 2.5, or 2.5.0 (any version from 2.2 up to but not including 2.5.1).
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 data2.5.1
Upgrade firmware to version V2.5.1 or later. Implement network-level controls such as rate limiting or firewall rules to restrict excessive incoming connections to the PLC.
- Consultation6.0 h
- Implementation4.0 h
- Testing8.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,144.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-7584 — 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-2020-7584 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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