{
  "cveId": "CVE-2023-40547",
  "url": "https://patchblox.com/security/cve/CVE-2023-40547",
  "summary": "CVE-2023-40547 is fixed in 36 products on 2 platforms, first by shim 15.8-0ubuntu1, released January 22, 2024. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "Redhat: CVE-2023-40547 Shim - RCE in HTTP boot support may lead to secure boot bypass",
  "description": "A remote code execution vulnerability was found in Shim. The Shim boot support trusts attacker-controlled values when parsing an HTTP response. This flaw allows an attacker to craft a specific malicious HTTP request, leading to a completely controlled out-of-bounds write primitive and complete system compromise. This flaw is only exploitable during the early boot phase, an attacker needs to perform a Man-in-the-Middle or compromise the boot server to be able to exploit this vulnerability successfully.",
  "published": "2024-01-22T16:00:00Z",
  "severity": "Critical",
  "cvss": 8.3,
  "cvssVector": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H",
  "cwe": "Heap-based Buffer Overflow",
  "epss": 0.05417,
  "epssPercentile": 0.92746,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "exploitabilityAssessment": "Exploitation Less Likely",
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-40547",
  "fixes": [
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1607 for 32-bit Systems",
      "fixedVersion": "14393.7259",
      "fix": "KB5041773",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041773",
      "released": "2024-08-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1607 for x64-based Systems",
      "fixedVersion": "14393.7259",
      "fix": "KB5041773",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041773",
      "released": "2024-08-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1809 for 32-bit Systems",
      "fixedVersion": "17763.6189",
      "fix": "KB5041578",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041578",
      "released": "2024-08-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1809 for x64-based Systems",
      "fixedVersion": "17763.6189",
      "fix": "KB5041578",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041578",
      "released": "2024-08-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 21H2 for 32-bit Systems",
      "fixedVersion": "",
      "fix": "KB5041580",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041580",
      "released": "2024-08-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 21H2 for ARM64-based Systems",
      "fixedVersion": "",
      "fix": "KB5041580",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041580",
      "released": "2024-08-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 21H2 for x64-based Systems",
      "fixedVersion": "",
      "fix": "KB5041580",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041580",
      "released": "2024-08-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 22H2 for 32-bit Systems",
      "fixedVersion": "",
      "fix": "KB5041580",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041580",
      "released": "2024-08-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 22H2 for ARM64-based Systems",
      "fixedVersion": "",
      "fix": "KB5041580",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041580",
      "released": "2024-08-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 22H2 for x64-based Systems",
      "fixedVersion": "",
      "fix": "KB5041580",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041580",
      "released": "2024-08-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 for 32-bit Systems",
      "fixedVersion": "10240.20751",
      "fix": "KB5041782",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041782",
      "released": "2024-08-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 for x64-based Systems",
      "fixedVersion": "10240.20751",
      "fix": "KB5041782",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041782",
      "released": "2024-08-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 11 Version 22H2 for ARM64-based Systems",
      "fixedVersion": "",
      "fix": "KB5041585",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041585",
      "released": "2024-08-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 11 Version 22H2 for x64-based Systems",
      "fixedVersion": "",
      "fix": "KB5041585",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041585",
      "released": "2024-08-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 11 Version 23H2 for ARM64-based Systems",
      "fixedVersion": "",
      "fix": "KB5041585",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041585",
      "released": "2024-08-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 11 Version 23H2 for x64-based Systems",
      "fixedVersion": "",
      "fix": "KB5041585",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041585",
      "released": "2024-08-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 11 Version 24H2 for ARM64-based Systems",
      "fixedVersion": "26100.1457",
      "fix": "KB5041571",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041571",
      "released": "2024-08-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 11 Version 24H2 for x64-based Systems",
      "fixedVersion": "26100.1457",
      "fix": "KB5041571",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041571",
      "released": "2024-08-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 11 version 21H2 for ARM64-based Systems",
      "fixedVersion": "22000.3147",
      "fix": "KB5041592",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041592",
      "released": "2024-08-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 11 version 21H2 for x64-based Systems",
      "fixedVersion": "22000.3147",
      "fix": "KB5041592",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041592",
      "released": "2024-08-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2012",
      "fixedVersion": "",
      "fix": "KB5041851",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041851",
      "released": "2024-08-13T12:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2012 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB5041851",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041851",
      "released": "2024-08-13T12:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2012 R2",
      "fixedVersion": "",
      "fix": "KB5041828",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041828",
      "released": "2024-08-13T12:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2012 R2 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB5041828",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041828",
      "released": "2024-08-13T12:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2016",
      "fixedVersion": "14393.7259",
      "fix": "KB5041773",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041773",
      "released": "2024-08-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2016 (Server Core installation)",
      "fixedVersion": "14393.7259",
      "fix": "KB5041773",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041773",
      "released": "2024-08-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2019",
      "fixedVersion": "17763.6189",
      "fix": "KB5041578",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041578",
      "released": "2024-08-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2019 (Server Core installation)",
      "fixedVersion": "17763.6189",
      "fix": "KB5041578",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041578",
      "released": "2024-08-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2022",
      "fixedVersion": "20348.2655",
      "fix": "KB5041160",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041160",
      "released": "2024-08-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2022 (Server Core installation)",
      "fixedVersion": "20348.2655",
      "fix": "KB5041160",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041160",
      "released": "2024-08-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2022, 23H2 Edition (Server Core installation)",
      "fixedVersion": "25398.1085",
      "fix": "KB5041573",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041573",
      "released": "2024-08-13T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "shim",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "15.8-1~deb12u1",
      "fix": "DEBIAN-CVE-2023-40547",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-40547",
      "released": "2024-01-25T16:15:07Z"
    },
    {
      "platform": "linux",
      "product": "shim",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "15.8-1",
      "fix": "DEBIAN-CVE-2023-40547",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-40547",
      "released": "2024-01-25T16:15:07Z"
    },
    {
      "platform": "linux",
      "product": "shim",
      "release": "Debian 14",
      "fixedVersion": "15.8-1",
      "fix": "DEBIAN-CVE-2023-40547",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-40547",
      "released": "2024-01-25T16:15:07Z"
    },
    {
      "platform": "linux",
      "product": "shim",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "15.8-0ubuntu1",
      "fix": "shim 15.8-0ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-shim-15.8-0ubuntu1",
      "released": "2024-01-22T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "shim",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "15.8-0ubuntu1",
      "fix": "shim 15.8-0ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-shim-15.8-0ubuntu1",
      "released": "2024-01-22T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "shim",
      "release": "Ubuntu 24.04.5 LTS (noble)",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-shim-15.8-0ubuntu1",
      "released": "2024-01-22T16:00:00Z"
    },
    {
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      "fix": "shim 15.8-0ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-oracular-shim-15.8-0ubuntu1",
      "released": "2024-01-23T00:00:00Z"
    },
    {
      "platform": "linux",
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      "release": "Ubuntu 25.04 (plucky)",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-shim-15.8-0ubuntu1",
      "released": "2024-01-23T00:00:00Z"
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    {
      "platform": "linux",
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      "fix": "RHSA-2024:1902",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2024-1902",
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    {
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      "released": "2024-04-18T00:00:00Z"
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    {
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    {
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      "url": "https://patchblox.com/security/fix/linux/alsa-2024-1903",
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      "fix": "ELSA-2024-1902",
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    {
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      "released": "2024-01-22T16:00:00Z"
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    {
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-oracular-shim-signed-1.58-15.8-0ubuntu1",
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    {
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-shim-signed-1.58",
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    {
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      "url": "https://patchblox.com/security/fix/linux/elsa-2024-1903",
      "released": "2024-04-22T00:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}