CVE-2021-31505

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    CVE-2021-31505

    Published: 29 Jun 2021Last Modified: 10 Mar 2026

    Summary:

    Details: This vulnerability allows attackers with physical access to escalate privileges on affected installations of Arlo Q Plus 1.9.0.3_278. Authentication is not required to exploit this vulnerability. The specific flaw exists within the SSH service. The device can be booted into a special operation mode where hard-coded credentials are accepted for SSH authentication. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of root. Was ZDI-CAN-12890.

    References: , https://kb.arlo.com/000062592/Security-Advisory-for-Arlo-Q-Plus-SSH-Use-of-Hard-coded-Credentials-Allowing-Privilege-Escalation, https://www.zerodayinitiative.com/advisories/ZDI-21-683/

    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-2021-31505 | CVE-DB