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    CVE-2020-13365

    Certain Zyxel products have a locally accessible binary that allows a non-root user to generate a password for an undocumented user account that can be used for a TELNET session as root. This affects NAS520 V5.21(AASZ.4)C0, V5.21(AASZ.0)C0, V5.11(AASZ.3)C0, and V5.11(AASZ.0)C0; NAS542 V5.11(ABAG.0)C0, V5.20(ABAG.1)C0, and V5.21(ABAG.3)C0; NSA325 v2_V4.81(AALS.0)C0 and V4.81(AAAJ.1)C0; NSA310 4.22(AFK.0)C0 and 4.22(AFK.1)C0; NAS326 V5.21(AAZF.8)C0, V5.11(AAZF.4)C0, V5.11(AAZF.2)C0, and V5.11(AAZF.3)C0; NSA310S V4.75(AALH.2)C0; NSA320S V4.75(AANV.2)C0 and V4.75(AANV.1)C0; NSA221 V4.41(AFM.1)C0; and NAS540 V5.21(AATB.5)C0 and V5.21(AATB.3)C0.

    Published:Aug 6, 2020
    Last Modified:Nov 21, 2024
    EPS:Aug 6, 2020
    EPSS Score:0.00128
    CVSS Score:8.8

    Affected Products

    Vendor
    Zyxel
    Product
    Nas326
    Vendor
    Zyxel
    Product
    Nas326 Firmware
    Vendor
    Zyxel
    Product
    Nas520
    Vendor
    Zyxel
    Product
    Nas520 Firmware
    Vendor
    Zyxel
    Product
    Nas540
    Vendor
    Zyxel
    Product
    Nas540 Firmware
    Vendor
    Zyxel
    Product
    Nas542
    Vendor
    Zyxel
    Product
    Nas542 Firmware

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-287 Improper Authentication

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    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