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    CVE-2021-36368

    An issue was discovered in OpenSSH before 8.9. If a client is using public-key authentication with agent forwarding but without -oLogLevel=verbose, and an attacker has silently modified the server to support the None authentication option, then the user cannot determine whether FIDO authentication is going to confirm that the user wishes to connect to that server, or that the user wishes to allow that server to connect to a different server on the user's behalf. NOTE: the vendor's position is "this is not an authentication bypass, since nothing is being bypassed.

    Published:Mar 12, 2022
    Last Modified:May 29, 2026
    EPS:Mar 12, 2022
    EPSS Score:0.00432
    CVSS Score:3.7

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Openbsd
    Product
    Openssh

    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