CVE•Published 2020-11-19•Modified 2026-05-29•0 articles on news•6 live references•NVD data

CVE-2020-7566Schneider-electric · Modicon_m221_firmware

Vulnerability data via NVD (ingested)

CVSS v3.1

7.3

HIGH

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

EPSS percentile

Exploit Prediction Scoring System · top 88% of all CVEs

Weaknesses (CWE)

CWE-334Small Space of Random Values

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.

Timeline

Published 2020-11-19

Modified 2026-05-29

External references

NVD MITRE Exploit-DB GitHub PoC trickest/cve VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2020-7566

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · OS

os:"Modicon M221 Firmware"

Hosts Shodan identified as running Modicon M221 Firmware.

More intel sources (5)

Shodan report

vuln:CVE-2020-7566

Country / ASN / product breakdown for the vuln query.

Censys

vulnerabilities.cve_id: CVE-2020-7566