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No exploitation reportedFix available

CVE-2018-7856

No exploitation reported by the sources we read.

  • Published2019-05-22
  • Fixed in3.10
  • WeaknessCWE-754

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 when writing invalid memory blocks to the controller over Modbus.

Timeline

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

Versions per branch

NVD
Schneider-electric modicon m340 firmwareversion to verify
BranchAffectedFixed in
3.10< 3.103.10
Schneider-electric modicon m580 firmwareversion to verify
BranchAffectedFixed in
2.90< 2.902.90
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. Update Schneider-electric modicon m340 firmware to 3.10
  2. 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…
  3. 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-…
  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: 140CPU65150 [C] & 140CPU65160 [C] - https://www.schneider-electric.com/en/download/document/Quantum_140CPU651X0_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: 140CPU65260 [C] - https://www.schneider-electric.com/en/download/document/Quantum_140CPU65260_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: 140CPU67261 [C] - https://www.schneider-electric.com/en/download/document/Quantum_140CPU67261_SV3.60
  7. 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

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

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
GitHub Advisory
GHSA-g8pp-m4fh-wjg4

Frequently asked questions

What is CVE-2018-7856?

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 when writing invalid memory blocks to the controller over Modbus.

Is CVE-2018-7856 actively exploited?

Active exploitation of CVE-2018-7856 has not been confirmed. Its EPSS score was 1.6% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-7856?

CVE-2018-7856 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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