VULNERABILITY INTELLIGENCE

CVE-2018-7790

CVSS score9.8 CRITICAL

EPSS probability2.48%

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

An Information Management Error 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 replay authentication sequences. If an attacker exploits this vulnerability and connects to a Modicon M221, the attacker can upload the original program from the PLC.

Weakness classification

CWE-294: Authentication Bypass by Capture-replay

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