CVE-2020-5597
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 · uneditedTCP/IP function included in the firmware of Mitsubishi Electric GOT2000 series (CoreOS with version -Y and earlier installed in GT27 Model, GT25 Model, and GT23 Model) contains a null pointer dereference vulnerability, which may allow a remote attacker to stop the network functions of the products or execute a malicious program via a specially crafted packet.
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 null pointer dereference vulnerability exists in the TCP/IP function of Mitsubishi Electric GOT2000 series firmware (CoreOS version -Y and earlier) on GT27, GT25, and GT23 models. A remote attacker can exploit this by sending a specially crafted packet to either cause denial of service (stop network functions) or potentially execute arbitrary code.
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<= yCVSS 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 GOT2000 model numberLocate the model label on the physical HMI device or check the model designation in the project settings/software. Confirm it is one of: GT27, GT25, or GT23.Affected if The model is not GT27, GT25, or GT23 (other models in the GOT2000 series may not be affected)
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Check the CoreOS firmware versionAccess the GOT2000 device firmware information via the utility menu or engineering software (GT Designer3). Look for the CoreOS version string. Compare it to version '-Y' (or earlier versions such as '-X', '-W', etc.).Affected if The CoreOS version is -Y or any version that comes before -Y in the alphabet (e.g., -X, -W, -V)
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Verify TCP/IP network function is enabledCheck the GOT2000 network configuration settings in GT Designer3 or on the device. Confirm that TCP/IP communication is configured and active for Ethernet or network communication.Affected if TCP/IP network functions are not configured or enabled (the vulnerability requires the TCP/IP stack to be active)
A user is affected if they have a GT27, GT25, or GT23 model running CoreOS version -Y or earlier with TCP/IP network functions enabled.
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 the GOT2000 CoreOS firmware to a version beyond -Y as provided by Mitsubishi Electric. If patching is not immediately possible, isolate affected devices on a restricted network segment to reduce attack surface.
- Consultation3.0 h
- Implementation6.0 h
- Testing4.0 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 $4,224.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-5597 — 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-2020-5597 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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