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    CVE-2021-20090

    A path traversal vulnerability in the web interfaces of Buffalo WSR-2533DHPL2 firmware version <= 1.02 and WSR-2533DHP3 firmware version <= 1.24 could allow unauthenticated remote attackers to bypass authentication.

    Published:Apr 29, 2021
    Last Modified:Nov 3, 2025
    EPS:Apr 29, 2021
    EPSS Score:0.94369
    CVSS Score:9.8

    CISA Notification

    Description

    A path traversal vulnerability in the web interfaces of Buffalo WSR-2533DHPL2 firmware version <= 1.02 and WSR-2533DHP3 firmware version <= 1.24 could allow unauthenticated remote attackers to bypass authentication.

    Required Action:

    Apply updates per vendor instructions.

    Notes:

    No extra notes provided.

    Due Date
    Nov 17, 2021
    1759 days ago
    Alert Date
    Nov 3, 2021
    1773 days ago

    Affected Products

    Vendor
    Buffalo
    Product
    Wsr-2533dhp3-bk
    Vendor
    Buffalo
    Product
    Wsr-2533dhp3-bk Firmware
    Vendor
    Buffalo
    Product
    Wsr-2533dhpl2-bk
    Vendor
    Buffalo
    Product
    Wsr-2533dhpl2-bk Firmware

    Exploits

    https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/https://www.tenable.com/security/research/tra-2021-13https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/https://www.tenable.com/security/research/tra-2021-13

    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