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    CVE-2023-6918

    A flaw was found in the libssh implements abstract layer for message digest (MD) operations implemented by different supported crypto backends. The return values from these were not properly checked, which could cause low-memory situations failures, NULL dereferences, crashes, or usage of the uninitialized memory as an input for the KDF. In this case, non-matching keys will result in decryption/integrity failures, terminating the connection.

    Published:Dec 18, 2023
    Last Modified:Nov 21, 2025
    EPS:Dec 18, 2023
    EPSS Score:0.02706
    CVSS Score:3.7

    Affected Products

    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Libssh
    Product
    Libssh
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-252 Unchecked Return Value

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    References

    https://access.redhat.com/errata/RHSA-2024:2504
    https://access.redhat.com/errata/RHSA-2024:3233
    https://access.redhat.com/security/cve/CVE-2023-6918
    https://bugzilla.redhat.com/show_bug.cgi?id=2254997
    https://www.libssh.org/2023/12/18/libssh-0-10-6-and-libssh-0-9-8-security-releases/
    https://www.libssh.org/security/advisories/CVE-2023-6918.txt
    https://access.redhat.com/errata/RHSA-2024:2504
    https://access.redhat.com/errata/RHSA-2024:3233
    https://access.redhat.com/security/cve/CVE-2023-6918
    https://bugzilla.redhat.com/show_bug.cgi?id=2254997
    https://lists.fedoraproject.org/archives/list/[email protected]/message/LZQVUHWVWRH73YBXUQJOD6CKHDQBU3DM/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/MKQRBF3DWMWPH36LBCOBUTSIZRTPEZXB/
    https://security.netapp.com/advisory/ntap-20250214-0009/
    https://www.libssh.org/2023/12/18/libssh-0-10-6-and-libssh-0-9-8-security-releases/
    https://www.libssh.org/security/advisories/CVE-2023-6918.txt

    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