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    CVE-2023-51767

    OpenSSH through 10.0, when common types of DRAM are used, might allow row hammer attacks (for authentication bypass) because the integer value of authenticated in mm_answer_authpassword does not resist flips of a single bit. NOTE: this is applicable to a certain threat model of attacker-victim co-location in which the attacker has user privileges. NOTE: this is disputed by the Supplier, who states "we do not consider it to be the application's responsibility to defend against platform architectural weaknesses."

    Published:Dec 24, 2023
    Last Modified:Nov 18, 2025
    EPS:Dec 24, 2023
    EPSS Score:0.00084
    CVSS Score:7

    Affected Products

    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Openbsd
    Product
    Openssh
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-287 Improper Authentication

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    References

    https://access.redhat.com/security/cve/CVE-2023-51767
    https://arxiv.org/abs/2309.02545
    https://bugzilla.redhat.com/show_bug.cgi?id=2255850
    https://github.com/openssh/openssh-portable/blob/8241b9c0529228b4b86d88b1a6076fb9f97e4a99/auth-passwd.c#L77
    https://github.com/openssh/openssh-portable/blob/8241b9c0529228b4b86d88b1a6076fb9f97e4a99/monitor.c#L878
    https://security.netapp.com/advisory/ntap-20240125-0006/
    https://ubuntu.com/security/CVE-2023-51767
    https://www.openwall.com/lists/oss-security/2025/09/22/1
    http://www.openwall.com/lists/oss-security/2025/09/22/1
    http://www.openwall.com/lists/oss-security/2025/09/22/2
    http://www.openwall.com/lists/oss-security/2025/09/23/1
    http://www.openwall.com/lists/oss-security/2025/09/23/3
    http://www.openwall.com/lists/oss-security/2025/09/23/4
    http://www.openwall.com/lists/oss-security/2025/09/23/5
    http://www.openwall.com/lists/oss-security/2025/09/24/4
    http://www.openwall.com/lists/oss-security/2025/09/24/7
    http://www.openwall.com/lists/oss-security/2025/09/25/2
    http://www.openwall.com/lists/oss-security/2025/09/25/6
    http://www.openwall.com/lists/oss-security/2025/09/26/2
    http://www.openwall.com/lists/oss-security/2025/09/26/4
    http://www.openwall.com/lists/oss-security/2025/09/27/1
    http://www.openwall.com/lists/oss-security/2025/09/27/2
    http://www.openwall.com/lists/oss-security/2025/09/27/3
    http://www.openwall.com/lists/oss-security/2025/09/27/4
    http://www.openwall.com/lists/oss-security/2025/09/27/5
    http://www.openwall.com/lists/oss-security/2025/09/27/6
    http://www.openwall.com/lists/oss-security/2025/09/27/7
    http://www.openwall.com/lists/oss-security/2025/09/28/7
    http://www.openwall.com/lists/oss-security/2025/09/29/1
    http://www.openwall.com/lists/oss-security/2025/09/29/4
    http://www.openwall.com/lists/oss-security/2025/09/29/5
    http://www.openwall.com/lists/oss-security/2025/09/29/6
    http://www.openwall.com/lists/oss-security/2025/10/01/1
    http://www.openwall.com/lists/oss-security/2025/10/01/2
    https://access.redhat.com/security/cve/CVE-2023-51767
    https://arxiv.org/abs/2309.02545
    https://bugzilla.redhat.com/show_bug.cgi?id=2255850
    https://github.com/openssh/openssh-portable/blob/8241b9c0529228b4b86d88b1a6076fb9f97e4a99/auth-passwd.c#L77
    https://github.com/openssh/openssh-portable/blob/8241b9c0529228b4b86d88b1a6076fb9f97e4a99/monitor.c#L878
    https://security.netapp.com/advisory/ntap-20240125-0006/
    https://ubuntu.com/security/CVE-2023-51767

    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