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    CVE-2017-6030

    A predictable value range from previous values issue was discovered in Schneider Electric Modicon PLCs Modicon M221, firmware versions prior to Version 1.5.0.0, Modicon M241, firmware versions prior to Version 4.0.5.11, and Modicon M251, firmware versions prior to Version 4.0.5.11. The affected products generate insufficiently random TCP initial sequence numbers that may allow an attacker to predict the numbers from previous values. This may allow an attacker to spoof or disrupt TCP connections.

    Published:Jun 30, 2017
    Last Modified:Jun 4, 2026
    EPS:Jun 30, 2017
    EPSS Score:0.00397
    CVSS Score:6.5

    Affected Products

    Vendor
    Schneider-electric
    Product
    Modicon M221
    Vendor
    Schneider-electric
    Product
    Modicon M221 Firmware
    Vendor
    Schneider-electric
    Product
    Modicon M241
    Vendor
    Schneider-electric
    Product
    Modicon M241 Firmware
    Vendor
    Schneider-electric
    Product
    Modicon M251
    Vendor
    Schneider-electric
    Product
    Modicon M251 Firmware

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-59 Session Credential Falsification through Prediction

    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-2020-7566 (CVSS 7.3) — A CWE-334: Small Space of Random Values vulnerability exists in Modicon M221 (all references, all versions) th…
    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,…

    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