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H0 EcomApplication · Koyo

CVE-2012-1805

HIGH · 10.0 CVSS v2.0 Published 2012-04-13
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
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
Buffer overflow in the ECOM Ethernet module in Koyo H0-ECOM, H0-ECOM100, H2-ECOM, H2-ECOM-F, H2-ECOM100, H4-ECOM, H4-ECOM-F, and H4-ECOM100 allows remote attackers to execute arbitrary code via long strings in unspecified parameters.

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

Buffer overflow vulnerability in the ECOM Ethernet module for multiple Koyo PLC Ethernet interface modules allows remote attackers to execute arbitrary code via long strings in unspecified parameters, achieving maximum severity (CVSS 10) due to the trivial exploitability and complete impact on confidentiality, integrity, and availability.

MitigationIsolate affected ECOM modules on a restricted network segment and apply vendor firmware updates if available; if no patch exists, implement compensating controls such as firewall rules limiting access to authorized engineering stations and monitoring for exploitation attempts.

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
H0 EcomApplication
Affected:all versions
H0 Ecom100Application
Affected:all versions
H2 EcomApplication
Affected:all versions
H2 Ecom FApplication
Affected:all versions
H2 Ecom100Application
Affected:all versions
H4 EcomApplication
Affected:all versions
H4 Ecom FApplication
Affected:all versions
H4 Ecom100Application
Affected:all versions

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
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete

AV:N/AC:L/Au:N/C:C/I:C/A:C

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 Koyo PLC hardware with ECOM modules
    Inventory the industrial control system for Koyo PLCs (H0, H2, H4 series) that utilize ECOM Ethernet interface modules. Review network diagrams, asset inventories, or physically inspect PLC hardware for ECOM module presence.
    Affected if Any Koyo PLC with an ECOM Ethernet module (H0 Ecom, H0 Ecom100, H2 Ecom, H2 Ecom F, H2 Ecom100, H4 Ecom, H4 Ecom F, H4 Ecom100) is present in the environment.
  2. Confirm ECOM Ethernet module is installed and active
    Check the PLC configuration or runtime status to verify the ECOM Ethernet module is physically installed and actively running. On the PLC, examine module status indicators or query the module via the programming software (such as Koyo DirectSOFT) for active Ethernet module detection.
    Affected if The ECOM Ethernet module shows as installed or active in the PLC configuration.
  3. Assess network accessibility of the ECOM module
    Determine if the ECOM Ethernet interface is reachable on the network by attempting to ping the module IP address, scanning for open ports (common ECOM ports include TCP 28784, 28785 for Koyo protocols), or reviewing firewall rules and network segmentation around the PLC.
    Affected if The ECOM Ethernet module has an IP address assigned and is accessible from any network segment beyond isolated engineering workstations.
  4. Review for suspicious or anomalous network traffic
    Monitor network logs or intrusion detection systems for unusual or excessively long parameter strings being sent to the ECOM module, or for signs of exploitation attempts targeting the Ethernet interface.
    Affected if Network traffic to the ECOM module contains abnormally long strings or patterns consistent with buffer overflow probing.

If a Koyo ECOM Ethernet module (any model, any firmware version) is present and its Ethernet interface is network-accessible, the environment is affected by this vulnerability.

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
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Isolate affected ECOM modules on a restricted network segment and apply vendor firmware updates if available; if no patch exists, implement compensating controls such as firewall rules limiting access to authorized engineering stations and monitoring for exploitation attempts.

Fix this in H0 Ecom Scoped from the published advisory
  • Consultation6.0 h
  • Implementation12.0 h
  • Testing6.0 h
  • Review / QA4.0 h
28.0 hours of engineering $4,980
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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-2012-1805 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