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    CVE-2023-6779

    An off-by-one heap-based buffer overflow was found in the __vsyslog_internal function of the glibc library. This function is called by the syslog and vsyslog functions. This issue occurs when these functions are called with a message bigger than INT_MAX bytes, leading to an incorrect calculation of the buffer size to store the message, resulting in an application crash. This issue affects glibc 2.37 and newer.

    Published:Jan 30, 2024
    Last Modified:May 12, 2026
    EPS:Jan 31, 2024
    EPSS Score:0.00654
    CVSS Score:8.2

    Affected Products

    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Gnu
    Product
    Glibc
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.htmlhttp://seclists.org/fulldisclosure/2024/Feb/3https://www.openwall.com/lists/oss-security/2024/01/30/6http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.htmlhttp://seclists.org/fulldisclosure/2024/Feb/3https://www.openwall.com/lists/oss-security/2024/01/30/6

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

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    References

    http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.html
    http://seclists.org/fulldisclosure/2024/Feb/3
    https://access.redhat.com/security/cve/CVE-2023-6779
    https://bugzilla.redhat.com/show_bug.cgi?id=2254395
    https://lists.fedoraproject.org/archives/list/[email protected]/message/D2FIH77VHY3KCRROCXOT6L27WMZXSJ2G/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/MWQ6BZJ6CV5UAW4VZSKJ6TO4KIW2KWAQ/
    https://security.gentoo.org/glsa/202402-01
    https://security.netapp.com/advisory/ntap-20240223-0006/
    https://www.openwall.com/lists/oss-security/2024/01/30/6
    https://www.qualys.com/2024/01/30/cve-2023-6246/syslog.txt
    http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.html
    http://seclists.org/fulldisclosure/2024/Feb/3
    https://access.redhat.com/security/cve/CVE-2023-6779
    https://bugzilla.redhat.com/show_bug.cgi?id=2254395
    https://lists.fedoraproject.org/archives/list/[email protected]/message/D2FIH77VHY3KCRROCXOT6L27WMZXSJ2G/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/MWQ6BZJ6CV5UAW4VZSKJ6TO4KIW2KWAQ/
    https://security.gentoo.org/glsa/202402-01
    https://security.netapp.com/advisory/ntap-20240223-0006/
    https://www.openwall.com/lists/oss-security/2024/01/30/6
    https://www.qualys.com/2024/01/30/cve-2023-6246/syslog.txt
    https://cert-portal.siemens.com/productcert/html/ssa-082556.html

    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