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Fencer Vulns
high 7.5

CVE-2018-7856 json

A CWE-248: Uncaught Exception vulnerability exists in all versions of the Modicon M580, Modicon M340, Modicon Quantum, and Modicon Premium…

published 2019-05-22 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-19568

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.6%
EPSS 1.6% chance of exploitation in 30 days, percentile 75%
public exploits
0
none known

Summary

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.

Patch / fix

  • schneider-electric modicon_m340_firmware 3.10
  • schneider-electric modicon_m580_firmware 2.90

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-25-114-01 updated cvss 7.5

Schneider Electric Modicon Controllers (Update A)

  • Schneider Electric Modicon M340 Controller Modicon M340 Firmware < 3.10
    affected: vendor fix, mitigation se.com
  • Schneider Electric Modicon M580 Controller Modicon M580 Firmware < 2.80
    affected: vendor fix, mitigation se.com
  • Schneider Electric Modicon Premium Controller Modicon Premium Firmware < 3.20
    affected: vendor fix, mitigation se.com
  • Schneider Electric Modicon Quantum Controller Modicon Quantum Firmware < 3.60
    affected: vendor fix, mitigation schneider-electric.com
  • Schneider Electric Modicon M340 Controller Modicon M340 Firmware 3.60 Schneider Electric Modicon M580 Controller Modicon M580 Firmware 4.20 Schneider Electric Modicon Premium Controller Modicon Premium Firmware 3.20 Schneider Electric Modicon Quantum Controller Modicon Quantum Firmware 3.60
    fixed

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

1.58% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • talosintelligence.com https://www.talosintelligence.com/vulnerability_reports/TALOS-2019-0767 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • n/a Modicon M580 Modicon M340 Modicon Quantum Modicon Premium

Classification

Weakness
  • CWE-754 Improper Check for Unusual or Exceptional Conditions

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.