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CVE Record

CVE-2018-7847: A CWE-284: Improper Access Control vulnerability exists in all versions of the Modicon M580, Modicon M340,...

A CWE-284: Improper Access Control vulnerability exists in all versions of the Modicon M580, Modicon M340, Modicon Quantum, and Modicon Premium which could cause denial of service or potential code execution by overwriting configuration settings of the controller over Modbus.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

This vulnerability affects Modicon industrial controllers and could let an unauthorized party overwrite controller configuration over Modbus. The stated impact is denial of service or possible code execution. For executives, the concern is operational disruption in environments using these PLC families, especially where Modbus access is not tightly controlled.

Executive priority

Treat this as a high-priority OT exposure review where affected Modicon controllers support critical operations. Focus first on reachable Modbus paths and vendor remediation status.

Technical view

CVE-2018-7847 is an improper access control issue in all versions of Modicon M580, M340, Quantum, and Premium controllers. The source description says configuration settings can be overwritten over Modbus, causing denial of service or potential code execution. The bundle does not provide CVSS details or product-specific remediation text.

Likely exposure

Exposure is most likely in operational technology networks running the listed Modicon PLC families with reachable Modbus services. The bundle does not identify internet exposure, specific firmware branches, or compensating controls.

Exploitation context

The CVE is not listed as CISA KEV in the provided bundle, and no cited source in the bundle states active exploitation. The risk remains serious because the impact involves industrial controller availability and possible code execution.

Researcher notes

Evidence is limited in the bundle: no CVSS vector, no CWE list beyond the title, and no remediation details are included. Talos reports are cited and should be reviewed for deeper technical context without assuming active exploitation.

Mitigation direction

  • Review Schneider Electric advisory SEVD-2019-134-11 for official remediation guidance.
  • Restrict Modbus access to trusted engineering and control systems only.
  • Remove unnecessary remote or cross-network paths to affected controllers.
  • Monitor for unexpected controller configuration changes and availability events.

Validation and detection

  • Inventory Modicon M580, M340, Quantum, and Premium controllers.
  • Confirm which controllers expose Modbus and to which network segments.
  • Compare deployed assets against Schneider Electric advisory SEVD-2019-134-11.
  • Review logs and change records for unexplained configuration writes or outages.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2018-7847 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
4Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/aModicon M580 Modicon M340 Modicon Quantum Modicon PremiumModicon M580 Modicon M340 Modicon Quantum Modicon PremiumListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.