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    CVE-2020-7566

    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:Nov 19, 2020
    Last Modified:May 29, 2026
    EPS:Nov 19, 2020
    EPSS Score:0.0004
    CVSS Score:7.1

    Affected Products

    Vendor
    Schneider-electric
    Product
    Modicon M221
    Vendor
    Schneider-electric
    Product
    Modicon M221 Firmware

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-334 Small Space of Random Values

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2020-28214 (CVSS 5.5) — A CWE-760: Use of a One-Way Hash with a Predictable Salt vulnerability exists in Modicon M221 (all references,…
    CVE-2020-7568 (CVSS 4.3) — A CWE-200: Exposure of Sensitive Information to an Unauthorized Actor vulnerability exists in Modicon M221 (al…
    CVE-2020-7567 (CVSS 5.7) — A CWE-311: Missing Encryption of Sensitive Data vulnerability exists in Modicon M221 (all references, all vers…
    CVE-2020-7565 (CVSS 7.3) — A CWE-326: Inadequate Encryption Strength vulnerability exists in Modicon M221 (all references, all versions) …
    CVE-2020-7489 (CVSS 9.8) — A CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') v…
    CVE-2019-6820 (CVSS 8.2) — A CWE-306: Missing Authentication for Critical Function vulnerability exists which could cause a modification …
    CVE-2018-7823 (CVSS 5.3) — A Environment (CWE-2) vulnerability exists in SoMachine Basic, all versions, and Modicon M221(all references, …
    CVE-2018-7822 (CVSS 5.5) — An Incorrect Default Permissions (CWE-276) vulnerability exists in SoMachine Basic, all versions, and Modicon …
    CVE-2018-7821 (CVSS 7.5) — An Environment (CWE-2) vulnerability exists in SoMachine Basic, all versions, and Modicon M221(all references,…
    CVE-2019-10953 (CVSS 7.5) — ABB, Phoenix Contact, Schneider Electric, Siemens, WAGO - Programmable Logic Controllers, multiple versions. R…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High