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    CVE-2023-40549

    An out-of-bounds read flaw was found in Shim due to the lack of proper boundary verification during the load of a PE binary. This flaw allows an attacker to load a crafted PE binary, triggering the issue and crashing Shim, resulting in a denial of service.

    Published:Jan 23, 2024
    Last Modified:Nov 20, 2025
    EPS:Jan 29, 2024
    EPSS Score:0.00064
    CVSS Score:6.2

    Affected Products

    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel Aus
    Vendor
    Redhat
    Product
    Rhel E4s
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Redhat
    Product
    Rhel Tus
    Vendor
    Redhat
    Product
    Shim

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-125 Out-of-bounds Read

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

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    References

    https://access.redhat.com/errata/RHSA-2024:1834
    https://access.redhat.com/errata/RHSA-2024:1835
    https://access.redhat.com/errata/RHSA-2024:1873
    https://access.redhat.com/errata/RHSA-2024:1876
    https://access.redhat.com/errata/RHSA-2024:1883
    https://access.redhat.com/errata/RHSA-2024:1902
    https://access.redhat.com/errata/RHSA-2024:1903
    https://access.redhat.com/errata/RHSA-2024:1959
    https://access.redhat.com/errata/RHSA-2024:2086
    https://access.redhat.com/security/cve/CVE-2023-40549
    https://bugzilla.redhat.com/show_bug.cgi?id=2241797
    https://access.redhat.com/errata/RHSA-2024:1834
    https://access.redhat.com/errata/RHSA-2024:1835
    https://access.redhat.com/errata/RHSA-2024:1873
    https://access.redhat.com/errata/RHSA-2024:1876
    https://access.redhat.com/errata/RHSA-2024:1883
    https://access.redhat.com/errata/RHSA-2024:1902
    https://access.redhat.com/errata/RHSA-2024:1903
    https://access.redhat.com/errata/RHSA-2024:1959
    https://access.redhat.com/errata/RHSA-2024:2086
    https://access.redhat.com/security/cve/CVE-2023-40549
    https://bugzilla.redhat.com/show_bug.cgi?id=2241797
    https://lists.debian.org/debian-lts-announce/2024/05/msg00009.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