Description
A CWE-334: Small Space of Random Values vulnerability exists in Modicon M221 (all references, all versions) that could allow the attacker to break the encryption keys when the attacker has captured the traffic between EcoStruxure Machine - Basic software and Modicon M221 controller.
Published: 2020-11-19
Score: 7.1 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
EUVD EUVD EUVD-2020-28691 A CWE-334: Small Space of Random Values vulnerability exists in Modicon M221 (all references, all versions) that could allow the attacker to break the encryption keys when the attacker has captured the traffic between EcoStruxure Machine - Basic software and Modicon M221 controller.
History

Fri, 29 May 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.3, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H'}


Subscriptions

Schneider-electric Modicon M221 Modicon M221 Firmware
cve-icon MITRE

Status: PUBLISHED

Assigner: schneider

Published:

Updated: 2026-05-29T18:27:20.594Z

Reserved: 2020-01-21T00:00:00.000Z

Link: CVE-2020-7566

cve-icon Vulnrichment

Updated: 2024-08-04T09:33:19.452Z

cve-icon NVD

Status : Modified

Published: 2020-11-19T22:15:15.020

Modified: 2026-06-17T03:25:01.507

Link: CVE-2020-7566

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses