CVE-2020-5598
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 an improper access control vulnerability, which may which may allow a remote attacker tobypass access restriction and 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 confidenceImproper access control vulnerability in the TCP/IP function of Mitsubishi Electric GOT2000 series HMI firmware (CoreOS version -Y and earlier) allows remote attackers to bypass access restrictions via specially crafted packets. Successful exploitation can stop network functions or enable execution of malicious programs on affected GT27, GT25, and GT23 models.
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
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
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 HMI modelLocate the model number on the device physical label or check via the GOT2000 system information menu. Confirm it is a GT27, GT25, or GT23 model from the GOT2000 series.Affected if The device is a Mitsubishi Electric GOT2000 series HMI (GT27, GT25, or GT23)
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Check the CoreOS firmware versionAccess the GOT2000 system settings menu and navigate to the CoreOS version information, or use the GOT2000 utility software to query the firmware version. Compare the version letter against 'Y'.Affected if The CoreOS version is Y or earlier (for example, version X, W, V, etc.)
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Verify TCP/IP networking is enabledCheck the GOT2000 network settings via the system menu or GT Designer3 software. Confirm the TCP/IP function is configured and active.Affected if TCP/IP networking is enabled and configured on the device
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Assess network exposure of the HMIReview network topology and firewall rules to determine if the HMI device is reachable from external or untrusted network segments. Check if direct IP access is permitted from outside the trusted network.Affected if The HMI is accessible from untrusted network segments or the internet without proper access controls
If the device is a GOT2000 series HMI (GT27/GT25/GT23) running CoreOS version Y or earlier with TCP/IP enabled and exposed to untrusted networks, the environment is affected by this vulnerability.
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 firmware to a patched version beyond CoreOS -Y; if no patch available, implement network segmentation and restrict access to the HMI devices via firewall or access control lists to reduce attack surface.
- Consultation4.0 h
- Implementation8.0 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 $5,120.
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Free · runs locallyCheck whether your project pulls in CVE-2020-5598 — 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-2020-5598 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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