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Public proof of conceptFix available

CVE-2018-7843

A public proof of concept exists; no exploitation attested.

  • Published2019-05-22
  • WeaknessCWE-125

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 denial of service when reading memory blocks with an invalid data size or with an invalid data offset in the controller over Modbus.

Timeline

dates in UTC
  1. 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-2018-7843?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-7843?format=csv
  • TAXII collection of exploited CVEs
  • 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 CISA11 products fixed · 11 known affected

    Schneider Electric Modicon Controllers (Update A)

    Modicon M580 Firmware Versions prior to v2.80 installed on Modicon M580 Controller · Modicon M340 Firmware Versions prior to v3.10 installed on Modicon M340 Controller · Modicon Quantum Firmware Versions prior to v3.60 installed on Modicon Quantum Controller 140CPU65150 [C] & 140CPU65160 [C] · +8 more

Full record on NVD

Fix

  1. 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…
  2. 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-…
  3. Vendor fix CISA ICSA-25-114-01 · 1 productVersion v3.60 of Modicon Quantum includes a fix for this vulnerability and is available for download here: 140CPU65150 [C] & 140CPU65160 [C] - https://www.schneider-electric.com/en/download/document/Quantum_140CPU651X0_SV3.60
  4. Vendor fix CISA ICSA-25-114-01 · 1 productVersion v3.60 of Modicon Quantum includes a fix for this vulnerability and is available for download here: 140CPU65260 [C] - https://www.schneider-electric.com/en/download/document/Quantum_140CPU65260_SV3.60
  5. Vendor fix CISA ICSA-25-114-01 · 1 productVersion v3.60 of Modicon Quantum includes a fix for this vulnerability and is available for download here: 140CPU67261 [C] - https://www.schneider-electric.com/en/download/document/Quantum_140CPU67261_SV3.60
  6. Vendor fix CISA ICSA-25-114-01 · 1 productVersion v3.60 of Modicon Quantum includes a fix for this vulnerability and is available for download here: 140CPU67060 [C] - https://www.schneider-electric.com/en/download/document/Quantum_140CPU67060_SV3.60

Advisories and patches

Detection

read 2026-11-03 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
1 repository, unverifiedyanissec/CVE-2018-7843
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-125read 2026-10-23
  • FIRST EPSSEPSS score3.2 %2026-11-03
  • PoC-in-GitHubproof of concept1read 2026-11-03

Identifiers

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-2018-7843?

A CWE-248: Uncaught Exception vulnerability exists in all versions of the Modicon M580, Modicon M340, Modicon Quantum, and Modicon Premium which could cause denial of service when reading memory blocks with an invalid data size or with an invalid data offset in the controller over Modbus.

Is CVE-2018-7843 actively exploited?

Active exploitation of CVE-2018-7843 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-2018-7843?

CVE-2018-7843 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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Sources for this record