CVE-2018-7838

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-07-15 · updated 2026-06-17
Weakness: CWE-119

Description

A CWE-119 Buffer Errors vulnerability exists in Modicon M580 CPU - BMEP582040, all versions before V2.90, and Modicon Ethernet Module BMENOC0301, all versions before V2.16, which could cause denial of service on the FTP service of the controller or the Ethernet BMENOC module when it receives a FTP CWD command with a data length greater than 1020 bytes. A power cycle is then needed to reactivate the FTP service.

Affected products

Schneider-Electric Bmeh582040 Firmware: before 2.90 — fixed in 2.90
Schneider-Electric Bmeh586040 Firmware: before 2.90 — fixed in 2.90
Schneider-Electric Bmenoc0301 Firmware: before 2.16 — fixed in 2.16
Schneider-Electric Modicon M580 Bmep581020 Firmware: before 2.90 — fixed in 2.90
Schneider-Electric Modicon M580 Bmep582020 Firmware: before 2.90 — fixed in 2.90
Schneider-Electric Modicon M580 Bmep582040 Firmware: before 2.90 — fixed in 2.90
Schneider-Electric Modicon M580 Bmep582040S Firmware: before 2.90 — fixed in 2.90
Schneider-Electric Modicon M580 Bmep583020 Firmware: before 2.90 — fixed in 2.90
Schneider-Electric Modicon M580 Bmep583040 Firmware: before 2.90 — fixed in 2.90
Schneider-Electric Modicon M580 Bmep584020 Firmware: before 2.90 — fixed in 2.90
Schneider-Electric Modicon M580 Bmep584040 Firmware: before 2.90 — fixed in 2.90
Schneider-Electric Modicon M580 Bmep585040 Firmware: before 2.90 — fixed in 2.90
Schneider-Electric Modicon M580 Bmep586040 Firmware: before 2.90 — fixed in 2.90

How to fix

Upgrade to a fixed version: Schneider-Electric Bmeh582040 Firmware 2.90; Schneider-Electric Bmeh586040 Firmware 2.90; Schneider-Electric Bmenoc0301 Firmware 2.16; Schneider-Electric Modicon M580 Bmep581020 Firmware 2.90; Schneider-Electric Modicon M580 Bmep582020 Firmware 2.90; Schneider-Electric Modicon M580 Bmep582040 Firmware 2.90; Schneider-Electric Modicon M580 Bmep582040S Firmware 2.90; Schneider-Electric Modicon M580 Bmep583020 Firmware 2.90; Schneider-Electric Modicon M580 Bmep583040 Firmware 2.90; Schneider-Electric Modicon M580 Bmep584020 Firmware 2.90; Schneider-Electric Modicon M580 Bmep584040 Firmware 2.90; Schneider-Electric Modicon M580 Bmep585040 Firmware 2.90. Check the vendor advisory for mitigations.

References

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