VULNERABILITY INTELLIGENCE

CVE-2018-7791

CVSS score9.8 CRITICAL

EPSS probability1.90%

CISA KEVNot currently listed

Published2018-08-29

Last modified2026-06-17

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

A Permissions, Privileges, and Access Control 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 overwrite the original password with their password. If an attacker exploits this vulnerability and overwrite the password, the attacker can upload the original program from the PLC.

Weakness classification

CWE-284: Improper Access Control
CWE-287: Improper Authentication

Primary references

cybersecurity@se.com — Third Party Advisory, VDB Entry
cybersecurity@se.com — Mitigation, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108 — Mitigation, Vendor Advisory