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.

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Advisories
Source ID Title
EUVD EUVD EUVD-2018-19503 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.
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 29 May 2026 14:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-284
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: schneider

Published:

Updated: 2026-05-29T13:59:17.157Z

Reserved: 2018-03-08T00:00:00.000Z

Link: CVE-2018-7791

cve-icon Vulnrichment

Updated: 2024-08-05T06:37:59.143Z

cve-icon NVD

Status : Modified

Published: 2018-08-29T21:29:01.180

Modified: 2026-05-29T15:16:16.447

Link: CVE-2018-7791

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses