High severity7.3NVD Advisory· Published Nov 19, 2020· Updated May 29, 2026
CVE-2020-7566
CVE-2020-7566
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.
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Affected products
4cpe:2.3:o:schneider-electric:modicon_m221_firmware:-:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:schneider-electric:modicon_m221_firmware:-:*:*:*:*:*:*:*
- (no CPE)range: all versions
- Schneider Electric/Modicon M221description
Patches
Vulnerability mechanics
References
2- us-cert.cisa.gov/ics/advisories/icsa-20-343-04nvdThird Party AdvisoryUS Government Resource
- www.se.com/ww/en/download/document/SEVD-2020-315-05/nvdVendor Advisory
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