CVE-2018-7851

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-05-22 · updated 2026-06-17
Weakness: CWE-119

Description

CWE-119: Buffer errors vulnerability exists in Modicon M580 with firmware prior to V2.50, Modicon M340 with firmware prior to V3.01, BMxCRA312xx with firmware prior to V2.40, All firmware versions of Modicon Premium and 140CRA312xxx when sending a specially crafted Modbus packet, which could cause a denial of service to the device that would force a restart to restore availability.

Affected products

Schneider-Electric 140Cra312Xxx Firmware: all versions
Schneider-Electric Bmx/E Cra Firmware: before 2.40 — fixed in 2.40
Schneider-Electric M340 Firmware: before 3.01 — fixed in 3.01
Schneider-Electric M580 Firmware: before 2.50 — fixed in 2.50
Schneider-Electric Modicon Premium Firmware: all versions

How to fix

Upgrade to a fixed version: Schneider-Electric Bmx/E Cra Firmware 2.40; Schneider-Electric M340 Firmware 3.01; Schneider-Electric M580 Firmware 2.50. Check the vendor advisory for mitigations.

References

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