CVE-2020-5596
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) does not properly manage sessions, 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 · high confidenceSession management vulnerability in the TCP/IP stack of Mitsubishi Electric GOT2000 series HMI panels (CoreOS version -Y and earlier) allows remote attackers to send specially crafted packets that can disrupt network functions or potentially execute malicious code 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 GOT2000 model numberPhysically inspect the device or check the device documentation/label to confirm if it is a GT27, GT25, or GT23 modelAffected if The model is GT27, GT25, or GT23 (any of these models are affected)
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Determine the CoreOS versionAccess the GOT2000 device settings or system information screen to check the installed CoreOS version. Compare the version letter to the affected range (<=Y)Affected if The CoreOS version is -Y or any earlier version (versions with letter <= Y in sequence)
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Verify TCP/IP stack is enabledCheck the GOT2000 network configuration settings to confirm the Ethernet/TCP/IP interface is enabled and configuredAffected if TCP/IP networking is enabled on the device (vulnerability is in the TCP/IP stack)
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Assess network exposureReview network topology and firewall rules to determine if the HMI panel is accessible from untrusted networks or the internetAffected if The device is directly accessible from external networks without proper segmentation or access controls
You are affected if you have a GT27, GT25, or GT23 model with CoreOS version -Y or earlier, and the TCP/IP stack is enabled with network exposure to untrusted attackers who can send specially crafted packets.
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 Mitsubishi Electric GOT2000 CoreOS firmware to a version later than -Y; apply network segmentation and access controls to limit exposure of affected devices until patching can be completed.
- Consultation6.0 h
- Implementation3.0 h
- Testing6.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,088.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-5596 — 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-2020-5596 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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