CVE-2021-20596

    Dashboard / Vulnerabilities / CVE-2021-20596

    CVE-2021-20596

    Published: 22 Jul 2021Last Modified: 10 Mar 2026

    Summary:

    Details: NULL Pointer Dereference in MELSEC-F Series FX3U-ENET firmware version 1.14 and prior, FX3U-ENET-L firmware version 1.14 and prior and FX3U-ENET-P502 firmware version 1.14 and prior allows a remote unauthenticated attacker to cause a DoS condition in communication by sending specially crafted packets. Control by MELSEC-F series PLC is not affected and system reset is required for recovery.

    References: , https://us-cert.cisa.gov/ics/advisories/icsa-21-201-01, https://jvn.jp/vu/JVNVU94348759/index.html, https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-006_en.pdf

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    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
    CVE-2021-20596 | CVE-DB