Public proof of conceptFix available

CVE-2018-7846

A public proof of concept exists; no exploitation attested.

Published2019-05-22
WeaknessCWE-668

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-501: Trust Boundary Violation vulnerability on connection to the Controller exists in all versions of the Modicon M580, Modicon M340, Modicon Quantum and Modicon Premium which could cause unauthorized access by conducting a brute force attack on Modbus protocol to the controller.

Timeline

dates in UTC

2019-05-2220:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 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-2018-7846?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-7846?format=csv
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Versions per branch

NVD

Schneider-electric modicon m340 firmwareversion to verify

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

Schneider-electric modicon m580 firmwareversion to verify

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

Schneider-electric modicon premium firmwareversion to verify

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

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 CISA2 products fixed · 5 known affected
Schneider Electric Modicon Controllers (Update A)
Modicon M580 Firmware Versions prior to v2.90 installed on Modicon M580 Controller · Modicon M340 Firmware Versions prior to v3.10 installed on Modicon M340 Controller · Modicon Quantum Firmware All Versions installed on Modicon Quantum Controller · +2 more

Full record on NVD

Fix

Vendor fix CISA ICSA-25-114-01 · 1 productVersion sv4.20 of Modicon M580 includes a fix for this vulnerability and is available for download here: STEP 1: Update software and firmware. • On the engineering workstation, update to EcoStruxure Control Expert v16.0: https://www.se.com/ww/en/product-range/548-ecostruxure-control-expert-unity-pr…
Vendor fix CISA ICSA-25-114-01 · 1 productVersion sv3.60 of Modicon M340 includes a fix for this vulnerability and is available for download here: STEP 1: Update software and firmware • On the engineering workstation, update to EcoStruxure Control Expert v16.0 or later: https://www.se.com/ww/en/product-range/548-ecostruxure-control-expert-…
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…
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…
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 …
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…

Advisories and patches

www.schneider-electric.comVendor Advisory

Detection

read 2026-11-02 22:42 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 1 repository, unverifiedyanissec/CVE-2018-7846
Metasploit modules: none listed

Sources

NVDCVSS 3.19.8read 2026-10-23
NVDCVSS 2.05read 2026-10-23
NVDweakness (CWE)CWE-668read 2026-10-23
FIRST EPSSEPSS score29.6 %read 2026-11-02
PoC-in-GitHubproof of concept1read 2026-11-02

Identifiers

EUVD-2018-19558same flawENISA EUVD · LicenseRef-ENISA-legal-notice

Technical details

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

Frequently asked questions

What is CVE-2018-7846?

Is CVE-2018-7846 actively exploited?

Active exploitation of CVE-2018-7846 has not been confirmed. Its EPSS score was 29.6% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-7846?

CVE-2018-7846 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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