CVE-2020-7566 Weak cryptography in Modicon M221, all references, all versions

What is CVE-2020-7566?

CVE-2020-7566 is a high-severity vulnerability in Modicon M221, all references, all versions, published on 19 Nov 2020. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official 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.

Weakness: CWE-334

Which versions are affected by CVE-2020-7566?

It affects 1 product.

Products include Schneider-Electric Modicon M221 Firmware.

How do I fix CVE-2020-7566?

No fix has been published for CVE-2020-7566 yet. Limit exposure of the affected software until one is available.

Is CVE-2020-7566 being exploited?

There is no known exploitation of CVE-2020-7566 in the wild and no public exploit code.

Other vulnerabilities in Modicon M221, all references, all versions

• CVE-2020-28214 Weak cryptography in Modicon M221 (all references, all versions) Critical 9.8
• CVE-2018-7790 Auth bypass in Modicon M221, all references, all versions prior to firmware V1.6.2.0 Critical 9.8
• CVE-2018-7791 Auth bypass in Modicon M221, all references, all versions prior to firmware V1.6.2.0 Critical 9.8
• CVE-2018-7821 Denial of service in SoMachine Basic and Modicon M221, SoMachine Basic, all versions Modicon M221, all references, all versions prior to firmware V1.10.0.0 High 7.5
• CVE-2018-7792 Weak cryptography in Modicon M221, all references, all versions prior to firmware V1.6.2.0 High 7.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-j9h7-v335-8gcp.