Vulnerability record · CVE-2018-7790 · published 29 August 2018

CVE-2018-7790: Schneider-electric modicon m221 firmware authentication bypass by capture-replay vulnerability

Schneider Electric · Modicon M221 Firmware

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.

9.8 CVSS 3.1 Critical EPSS 2.5% · top 16.1% CWE-294 · Authentication bypass by capture-replay

9.8CVSS 3.1 base score, v2 7.5

2.5%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

4References

17 Jun 2026Last modified by NVD

Description

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Modicon M221 Firmware Schneider Electric

References

Link	Tags
http://www.securityfocus.com/bid/105182	Third Party AdvisoryVDB Entry
https://www.schneider-electric.com/en/download/document/SEVD-2018-235-01/	MitigationVendor Advisory
http://www.securityfocus.com/bid/105182	Third Party AdvisoryVDB Entry
https://www.schneider-electric.com/en/download/document/SEVD-2018-235-01/	MitigationVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2018-7790), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.