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CVE Record

CVE-2018-7852: A CWE-248: Uncaught Exception vulnerability exists in all versions of the Modicon M580, Modicon M340, Modic...

A CWE-248: Uncaught Exception vulnerability exists in all versions of the Modicon M580, Modicon M340, Modicon Quantum, and Modicon Premium which could cause denial of service when an invalid private command parameter is sent to the controller over Modbus.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This vulnerability can crash or deny service to listed Schneider Modicon PLC controllers when malformed private Modbus parameters reach the controller. For executives, the concern is operational disruption, not data theft. The source bundle does not provide CVSS, patch details, or evidence of active exploitation.

Executive priority

Treat this as an operational resilience issue for environments using the named Modicon PLCs. Prioritize asset inventory, network reachability review, and vendor guidance checks before emergency action, unless controllers are exposed beyond tightly controlled OT segments.

Technical view

CVE-2018-7852 is reported as CWE-248, an uncaught exception in all versions of Modicon M580, M340, Quantum, and Premium. An invalid private command parameter sent over Modbus could cause denial of service. Available bundle evidence names affected families and impact but lacks detailed remediation data.

Likely exposure

Exposure is most likely where affected Modicon controllers are reachable over Modbus from engineering stations, OT network segments, remote access paths, or poorly segmented IT networks. Internet exposure would raise urgency, but the source bundle does not state internet exposure prevalence.

Exploitation context

The bundle marks KEV as false and provides no cited evidence of active exploitation. The described condition requires sending an invalid private command parameter over Modbus to the controller. No exploit maturity, public exploit status, or authentication requirements are confirmed in the supplied evidence.

Researcher notes

Evidence is limited to the CVE description and listed advisories. The core issue is denial of service from malformed private Modbus parameters causing an uncaught exception. Avoid assuming patches, exploit availability, or exact affected firmware beyond the supplied all-versions statement.

Mitigation direction

  • Review Schneider advisory SEVD-2019-134-11 for official remediation guidance.
  • Restrict Modbus access to trusted engineering and control systems only.
  • Segment affected PLC networks from corporate and internet-accessible networks.
  • Monitor for unexpected or unauthorized Modbus traffic to controllers.
  • Plan maintenance windows for vendor-recommended updates or configuration changes.

Validation and detection

  • Inventory Modicon M580, M340, Quantum, and Premium controllers.
  • Confirm whether affected controllers accept Modbus traffic.
  • Map which hosts can reach controller Modbus services.
  • Review firewall and remote access rules for OT-to-IT paths.
  • Check Schneider guidance for affected versions and remediation status.
Prepared
Confidence
medium
Sources
4

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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CVE-2018-7852 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
3Source 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.