CVE-2018-7789

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-08-29 · updated 2026-06-17
Weakness: CWE-754

Description

An Improper Check for Unusual or Exceptional Conditions vulnerability exists in Schneider Electric's Modicon M221 product (all references, all versions prior to firmware V1.6.2.0). The vulnerability allows unauthorized users to remotely reboot Modicon M221 using crafted programing protocol frames.

Affected products

Modicon M221, all references, all versions: before 1.6.2.0 — fixed in 1.6.2.0

How to fix

Upgrade to a fixed version: Modicon M221, all references, all versions 1.6.2.0. Check the vendor advisory for mitigations.

References

http://www.securityfocus.com/bid/105171
https://ics-cert.us-cert.gov/advisories/ICSA-18-240-02
https://www.schneider-electric.com/en/download/document/SEVD-2018-233-01/
http://www.securityfocus.com/bid/105171
https://ics-cert.us-cert.gov/advisories/ICSA-18-240-02
https://www.schneider-electric.com/en/download/document/SEVD-2018-233-01/

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