CVE-2018-7857

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2019-05-22 · updated 2026-06-17
Weakness: CWE-754

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 out of bounds variables to the controller over Modbus.

Affected products

Schneider-Electric Modicon M340 Firmware: before 3.01 — fixed in 3.01
Schneider Electric SE Modicon M580: before 2.80 — fixed in 2.80
Schneider-Electric Modicon Premium Firmware: before 3.20 — fixed in 3.20
Modicon Quantum - all firmware versions: before 3.60 — fixed in 3.60

How to fix

Upgrade to a fixed version: Schneider-Electric Modicon M340 Firmware 3.01; Schneider Electric SE Modicon M580 2.80; Schneider-Electric Modicon Premium Firmware 3.20; Modicon Quantum - all firmware versions 3.60. Check the vendor advisory for mitigations.

References

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