CVE-2016-20012

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    CVE-2016-20012

    Published: 15 Sept 2021Last Modified: 8 Jul 2026

    Summary:

    Details: OpenSSH through 8.7 allows remote attackers, who have a suspicion that a certain combination of username and public key is known to an SSH server, to test whether this suspicion is correct. This occurs because a challenge is sent only when that combination could be valid for a login session. NOTE: the vendor does not recognize user enumeration as a vulnerability for this product

    References: https://security.netapp.com/advisory/ntap-20211014-0005/, https://utcc.utoronto.ca/~cks/space/blog/tech/SSHKeysAreInfoLeak, https://www.openwall.com/lists/oss-security/2018/08/24/1, https://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097, https://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185, https://github.com/openssh/openssh-portable/pull/270, https://github.com/openssh/openssh-portable/blob/d0fffc88c8fe90c1815c6f4097bc8cbcabc0f3dd/auth2-pubkey.c#L261-L265, https://rushter.com/blog/public-ssh-keys/

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    V_8_7_P1

    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-2016-20012 | CVE-DB