CVE-2021-36369

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    CVE-2021-36369

    Published: 12 Oct 2022Last Modified: 7 Aug 2026

    Summary:

    Details: An issue was discovered in Dropbear through 2020.81. Due to a non-RFC-compliant check of the available authentication methods in the client-side SSH code, it is possible for an SSH server to change the login process in its favor. This attack can bypass additional security measures such as FIDO2 tokens or SSH-Askpass. Thus, it allows an attacker to abuse a forwarded agent for logging on to another server unnoticed.

    References: https://github.com/mkj/dropbear/pull/128, https://github.com/mkj/dropbear/releases, https://github.com/mkj/dropbear/releases/tag/DROPBEAR_2022.82, https://lists.debian.org/debian-lts-announce/2022/11/msg00015.html

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    DROPBEAR_2020.81

    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-2021-36369 | CVE-DB