Public proof of conceptFix available

CVE-2018-7849

A public proof of concept exists; no exploitation attested.

Published2019-05-22
WeaknessCWE-755

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-248: Uncaught Exception vulnerability exists in all versions of the Modicon M580, Modicon M340, Modicon Quantum and Modicon Premium which could cause a possible Denial of Service due to improper data integrity check when sending files the controller over Modbus.

Timeline

dates in UTC

2019-05-2220:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-04 03:37 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-2018-7849?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-7849?format=csv
TAXII collection of exploited CVEs
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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 2026-11-03 22:42 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 1 repository, unverifiedyanissec/CVE-2018-7849
Metasploit modules: none listed

Sources

NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
NVDweakness (CWE)CWE-755read 2026-10-23
FIRST EPSSEPSS score3.2 %2026-11-03
PoC-in-GitHubproof of concept1read 2026-11-03

Identifiers

EUVD-2018-19561same 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:N/I:N/A:H
Published: 2019-05-22
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2018-7849?

Is CVE-2018-7849 actively exploited?

Active exploitation of CVE-2018-7849 has not been confirmed. Its EPSS score was 3.2% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-7849?

CVE-2018-7849 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:N/I:N/A:H.

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