HOMEVULNERABILITIESCVE-2018-7842
CRITICAL

CVE-2018-7842

CWE-290Published: May 22, 2019· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2018-7842 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

schneider-electric8 product(s)
modicon m580 firmwaremodicon m580modicon m340 firmwaremodicon m340modicon quantum firmwaremodicon quantummodicon premium firmwaremodicon premium
Source: NVD CPE · 8 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://www.schneider-electric.com/en/download/document/SEVD-2019-134-11/
ADVISORYhttps://www.talosintelligence.com/vulnerability_reports/TALOS-2018-0741
ADVISORYhttps://www.schneider-electric.com/en/download/document/SEVD-2019-134-11/
ADVISORYhttps://www.talosintelligence.com/vulnerability_reports/TALOS-2018-0741

All References (4)

→
https://www.schneider-electric.com/en/download/document/SEVD-2019-134-11/Vendor Advisory
→
https://www.talosintelligence.com/vulnerability_reports/TALOS-2018-0741Exploit · Third Party Advisory
→
https://www.schneider-electric.com/en/download/document/SEVD-2019-134-11/Vendor Advisory
→
https://www.talosintelligence.com/vulnerability_reports/TALOS-2018-0741Exploit · Third Party Advisory

Quick Facts

CVE IDCVE-2018-7842
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-290
CISA KEVNo
Affected1 vendor(s)
PublishedMay 22, 2019

Related CVEs (CWE-290)

CVE-2026-39858
10.0
CVE-2020-5415
10.0
CVE-2026-6213
10.0
CVE-2026-54782
10.0
CVE-2025-34063
10.0
CVE-2025-27671
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2018-7842 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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