CVE-2020-29583

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    CVE-2020-29583

    Published: 22 Dec 2020Last Modified: 10 Mar 2026

    Summary:

    Details: Firmware version 4.60 of Zyxel USG devices contains an undocumented account (zyfwp) with an unchangeable password. The password for this account can be found in cleartext in the firmware. This account can be used by someone to login to the ssh server or web interface with admin privileges.

    References: , http://ftp.zyxel.com/USG40/firmware/USG40_4.60%28AALA.1%29C0_2.pdf, https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-29583, https://www.zyxel.com/support/security_advisories.shtml, https://businessforum.zyxel.com/discussion/5254/whats-new-for-zld4-60-patch-1-available-on-dec-15, https://www.eyecontrol.nl/blog/undocumented-user-account-in-zyxel-products.html, https://www.zyxel.com/support/CVE-2020-29583.shtml, https://businessforum.zyxel.com/discussion/5252/zld-v4-60-revoke-and-wk48-firmware-release, https://www.secpod.com/blog/a-secret-zyxel-firewall-and-ap-controllers-could-allow-for-administrative-access-cve-2020-29583/

    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-2020-29583 | CVE-DB