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Industrial Gateway ServerApplication · Ge

CVE-2020-27267

CRITICAL · 9.1 CVSS v3.1 Published 2021-01-14
Fix available
A fix is available. Upgrade to after 6.9 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

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 · unedited
KEPServerEX v6.0 to v6.9, ThingWorx Kepware Server v6.8 and v6.9, ThingWorx Industrial Connectivity (all versions), OPC-Aggregator (all versions), Rockwell Automation KEPServer Enterprise, GE Digital Industrial Gateway Server v7.68.804 and v7.66, and Software Toolbox TOP Server all 6.x versions, are vulnerable to a heap-based buffer overflow. Opening a specifically crafted OPC UA message could allow an attacker to crash the server and potentially leak data.

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 confidence

Heap-based buffer overflow vulnerability in OPC UA server implementations. Specially crafted OPC UA messages can trigger heap memory corruption, potentially allowing denial of service, data leakage, or code execution.

MitigationApply vendor patches for affected products (KEPServerEX, ThingWorx Kepware Server, OPC-Aggregator, GE Digital Industrial Gateway Server, TOP Server) and implement network segmentation to limit exposure to untrusted OPC UA clients.

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
Industrial Gateway ServerApplication
Affected:= 7.66= 7.68.804
Kepware KepserverexApplication
Affected:= 6.0= 6.9
Opc AggregatorApplication
Affected:all versions
Thingworx Industrial ConnectivityApplication
Affected:all versions
Thingworx Kepware ServerApplication
Affected:= 6.8= 6.9
Kepserver EnterpriseApplication
Affected:= 6.6.504.0= 6.9.572.0
Top ServerApplication
Affected:>= 6.0, <= 6.9

CVSS 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
High
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify installed OPC UA server product
    Check installed programs or running services for one of these: GE Industrial Gateway Server, KEPServerEX, OPC Aggregator, ThingWorx Industrial Connectivity, ThingWorx Kepware Server, Kepserver Enterprise, or Top Server. Use 'Programs and Features' or check running services list.
    Affected if Any of the listed products are installed with versions matching the affected ranges or all versions for Ptc Opc Aggregator/Thingworx Industrial Connectivity
  2. Determine product version
    Open the product's management interface or check its About/Version information. For KEPServerEX, right-click the tray icon and select 'About'. For Top Server, check the application properties. Compare the version number to the affected ranges: GE (7.66, 7.68.804), KEPServerEX (6.0-6.9), ThingWorx Kepware Server (6.8-6.9), Kepserver Enterprise (6.6.504.0-6.9.572.0), Top Server (6.0-6.9).
    Affected if Installed version falls within or matches the specified affected version ranges
  3. Verify OPC UA server is enabled
    Check the OPC UA server configuration in the product's management console. Look for 'OPC UA' server settings, typically found under 'Advanced' or 'Server Configuration' settings in the product interface.
    Affected if OPC UA server interface is enabled and running (not disabled or only classic OPC DA enabled)
  4. Check network exposure
    Use 'netstat -an' or review firewall rules to determine if the OPC UA port (default 4840) is listening on any network interface. Check if the server is bound to 0.0.0.0 or external IP addresses rather than localhost only.
    Affected if OPC UA service is listening on non-loopback interfaces, indicating potential external exposure

User is affected if they have any of the listed OPC UA server products installed with a vulnerable version and the OPC UA server feature is enabled and network-accessible.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Upgrade available Upgrade to a release after 6.9
Interim mitigation

Apply vendor patches for affected products (KEPServerEX, ThingWorx Kepware Server, OPC-Aggregator, GE Digital Industrial Gateway Server, TOP Server) and implement network segmentation to limit exposure to untrusted OPC UA clients.

Fix this in Industrial Gateway Server Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA2.0 h
20.0 hours of engineering $3,500
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An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,600.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2020-27267 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • 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
  • No spam, self-promotion, credentials, or personal data