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CVE Record

CVE-2018-7842: A CWE-290: Authentication Bypass by Spoofing vulnerability exists in all versions of the Modicon M580, Modi...

A CWE-290: Authentication Bypass by Spoofing vulnerability exists in all versions of the Modicon M580, Modicon M340, Modicon Quantum, and Modicon Premium which could cause an elevation of privilege by conducting a brute force attack on Modbus parameters sent to the controller.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

This flaw affects Schneider Modicon PLC families used in industrial environments. The public CVE says spoofing can bypass authentication and lead to elevated privilege by brute forcing Modbus parameters sent to a controller. Treat exposed or poorly segmented controllers as urgent, but the provided bundle does not include CVSS, patch details, or confirmed exploitation.

Executive priority

Prioritize this for OT environments because it involves industrial controllers and potential privilege elevation. Urgency depends on where the controllers sit, who can reach them, and what Schneider’s advisory recommends. Lack of CVSS and exploitation evidence lowers certainty, not operational relevance.

Technical view

CVE-2018-7842 is described as CWE-290 authentication bypass by spoofing in all versions of Modicon M580, M340, Quantum, and Premium. The stated impact is elevation of privilege through brute forcing Modbus parameters sent to the controller. The bundle cites Schneider Electric advisory SEVD-2019-134-11 and Talos TALOS-2018-0741, but provides no CVSS vector or fix details.

Likely exposure

Organizations using Modicon M580, M340, Quantum, or Premium controllers may be exposed, especially where Modbus/controller communications are reachable beyond tightly controlled OT networks. The bundle says all versions are affected, but does not list CPEs or specific firmware ranges.

Exploitation context

The source bundle does not show CISA KEV listing or any cited evidence of active exploitation. It describes a plausible attack condition involving spoofing and brute forcing Modbus parameters, but does not provide exploit maturity, public exploit status, or observed attacker activity.

Researcher notes

Do not infer more affected products than the four Modicon families named in the bundle. The CVE description is terse and severity metadata is incomplete. Use Schneider’s advisory and Talos report for authoritative technical specifics before validation or remediation planning.

Mitigation direction

  • Check Schneider Electric advisory SEVD-2019-134-11 for official fixes or mitigations.
  • Inventory Modicon M580, M340, Quantum, and Premium controllers in OT environments.
  • Restrict controller and Modbus access to trusted OT management paths.
  • Review firewall and segmentation rules around PLC networks.
  • Plan remediation through OT change control and maintenance windows.

Validation and detection

  • Confirm whether listed Modicon controller families are deployed.
  • Map which networks can reach controller Modbus interfaces.
  • Review firmware and configuration against Schneider advisory guidance.
  • Check OT monitoring for unexpected Modbus parameter activity.
  • Document compensating controls where vendor remediation is unavailable.
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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description · low confidence lookup

Credential and access behavior lookup

The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
description · low confidence lookup

Privilege behavior lookup

The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2018-7842 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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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.