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Public proof of concept

CVE-2018-7844

A public proof of concept exists; no exploitation attested.

  • Published2019-05-22
  • WeaknessCWE-200

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A CWE-200: Information Exposure vulnerability exists in all versions of the Modicon M580, Modicon M340, Modicon Quantum, and Modicon Premium which could cause the disclosure of SNMP information when reading memory blocks from the controller over Modbus.

Timeline

dates in UTC
  1. 2019-05-2221:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-03 15:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2018-7844?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-7844?format=csv
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  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Schneider-electric modicon m340 firmwareversion to verify
BranchAffectedFixed in
—all versionsno fix published
Schneider-electric modicon m580 firmwareversion to verify
BranchAffectedFixed in
—all versionsno fix published
Schneider-electric modicon premium firmwareversion to verify
BranchAffectedFixed in
—all versionsno fix published

1 more product in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • ICSA-25-114-01 CISA5 known affected

    Schneider Electric Modicon Controllers (Update A)

    Modicon M580 Firmware All Versions installed with Modicon M580 Controller · Modicon M340 Firmware All Versions installed on Modicon M340 Controller · Modicon Quantum Firmware All Versions installed on Modicon Quantum Controller · +2 more

Full record on NVD

Fix

  1. Mitigation from the vendor CISA ICSA-25-114-01 · 1 productIt is recommended to apply the following mitigations to reduce the risk of exploitation: • Set up an application password in the project properties • Set up network segmentation and implement a firewall to block all unauthorized access to port 502/TCP • Configure the Access Control List following t…
  2. Mitigation from the vendor CISA ICSA-25-114-01 · 1 productIt is recommended to apply the following mitigations to reduce the risk of exploitation: • Set up an application password in the project properties • Set up network segmentation and implement a firewall to block all unauthorized access to port 502/TCP • Configure the Access Control List follo…
  3. Mitigation from the vendor CISA ICSA-25-114-01 · 2 productsTo mitigate the risks associated with Modbus/ weaknesses, users should immediately: • Set up network segmentation and implement a firewall to block all unauthorized access to port 502/TCP • Configure the Access Control List feature as mentioned in “Quantum using EcoStruxure Control Expert - TCP/IP …
  4. Mitigation from the vendor CISA ICSA-25-114-01 · 1 productTo mitigate the risks associated with Modbus/ weaknesses, users should immediately: • Set up network segmentation and implement a firewall to block all unauthorized access to port 502/TCP • Configure the Access Control List following the recommendations of the user manual “Premium and Atrium us…
  5. No fix planned, says the vendor CISA ICSA-25-114-01 · 2 productsSchneider Electric’s Modicon Quantum and Quantum Safety controllers have reached their end of life and are no longer commercially available. They have been replaced by the Modicon M580 or M580 Safety ePAC controller, our most current product offer. Customers should strongly consider migrating to th…
  6. No fix planned, says the vendor CISA ICSA-25-114-01 · 1 productSchneider Electric’s Modicon Premium controllers have reached their end of life and are no longer commercially available. They have been replaced by the Modicon M580 ePAC controller, our most current product offer. Customers should strongly consider migrating to the Modicon M580 ePAC. Please contac…

Advisories and patches

Detection

read 2026-11-02 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
1 repository, unverifiedyanissec/CVE-2018-7844
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.17.5read 2026-10-23
  • NVDCVSS 2.05read 2026-10-23
  • NVDweakness (CWE)CWE-200read 2026-10-23
  • FIRST EPSSEPSS score2.8 %2026-11-03
  • PoC-in-GitHubproof of concept1read 2026-11-02

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
2019-05-22
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2018-7844?

A CWE-200: Information Exposure vulnerability exists in all versions of the Modicon M580, Modicon M340, Modicon Quantum, and Modicon Premium which could cause the disclosure of SNMP information when reading memory blocks from the controller over Modbus.

Is CVE-2018-7844 actively exploited?

Active exploitation of CVE-2018-7844 has not been confirmed. Its EPSS score was 2.8% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-7844?

CVE-2018-7844 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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