{
  "cveId": "CVE-2020-1054",
  "url": "https://patchblox.com/security/cve/CVE-2020-1054",
  "summary": "CVE-2020-1054 is fixed in 41 products on 1 platform, first by KB4556813, released May 12, 2020. It is being exploited: CISA added it to the Known Exploited Vulnerabilities catalog on November 3, 2021. Patch Radar priority: Patch now.",
  "title": "Win32k Elevation of Privilege Vulnerability",
  "description": "\u003Cp\u003EAn elevation of privilege vulnerability exists in Windows when the Windows kernel-mode driver fails to properly handle objects in memory. An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.\u003C/p\u003E\n\u003Cp\u003ETo exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerability and take control of an affected system.\u003C/p\u003E\n\u003Cp\u003EThe update addresses this vulnerability by correcting how the Windows kernel-mode driver handles objects in memory.\u003C/p\u003E",
  "published": "2020-05-14T07:00:00Z",
  "severity": "Important",
  "cvss": 7,
  "epss": 0.53878,
  "epssPercentile": 0.99007,
  "priority": "Patch now",
  "priorityTier": 1,
  "exploited": true,
  "vendorExploited": false,
  "disclosed": false,
  "exploitabilityAssessment": "Exploitation More Likely",
  "kev": {
    "added": "2021-11-03T00:00:00Z",
    "due": "2022-05-03T00:00:00Z",
    "ransomware": false,
    "requiredAction": "Apply updates per vendor instructions."
  },
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1054",
  "fixes": [
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1607 for 32-bit Systems",
      "fixedVersion": "14393.3686",
      "fix": "KB4556813",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556813",
      "released": "2020-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1607 for x64-based Systems",
      "fixedVersion": "14393.3686",
      "fix": "KB4556813",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556813",
      "released": "2020-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1709 for 32-bit Systems",
      "fixedVersion": "16299.1868",
      "fix": "KB4556812",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556812",
      "released": "2020-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1709 for ARM64-based Systems",
      "fixedVersion": "16299.1868",
      "fix": "KB4556812",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556812",
      "released": "2020-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1709 for x64-based Systems",
      "fixedVersion": "16299.1868",
      "fix": "KB4556812",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556812",
      "released": "2020-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1803 for 32-bit Systems",
      "fixedVersion": "17134.1488",
      "fix": "KB4556807",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556807",
      "released": "2020-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1803 for ARM64-based Systems",
      "fixedVersion": "17134.1488",
      "fix": "KB4556807",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556807",
      "released": "2020-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1803 for x64-based Systems",
      "fixedVersion": "17134.1488",
      "fix": "KB4556807",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556807",
      "released": "2020-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1809 for 32-bit Systems",
      "fixedVersion": "17763.1217",
      "fix": "KB4551853",
      "url": "https://patchblox.com/security/fix/microsoft/kb4551853",
      "released": "2020-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1809 for ARM64-based Systems",
      "fixedVersion": "17763.1217",
      "fix": "KB4551853",
      "url": "https://patchblox.com/security/fix/microsoft/kb4551853",
      "released": "2020-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1809 for x64-based Systems",
      "fixedVersion": "17763.1217",
      "fix": "KB4551853",
      "url": "https://patchblox.com/security/fix/microsoft/kb4551853",
      "released": "2020-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1903 for 32-bit Systems",
      "fixedVersion": "",
      "fix": "KB4556799",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556799",
      "released": "2020-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1903 for ARM64-based Systems",
      "fixedVersion": "",
      "fix": "KB4556799",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556799",
      "released": "2020-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1903 for x64-based Systems",
      "fixedVersion": "",
      "fix": "KB4556799",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556799",
      "released": "2020-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1909 for 32-bit Systems",
      "fixedVersion": "",
      "fix": "KB4556799",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556799",
      "released": "2020-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1909 for ARM64-based Systems",
      "fixedVersion": "",
      "fix": "KB4556799",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556799",
      "released": "2020-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1909 for x64-based Systems",
      "fixedVersion": "",
      "fix": "KB4556799",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556799",
      "released": "2020-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 for 32-bit Systems",
      "fixedVersion": "10240.18575",
      "fix": "KB4556826",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556826",
      "released": "2020-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 for x64-based Systems",
      "fixedVersion": "10240.18575",
      "fix": "KB4556826",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556826",
      "released": "2020-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 7 for 32-bit Systems Service Pack 1",
      "fixedVersion": "",
      "fix": "KB4556836",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556836",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 7 for 32-bit Systems Service Pack 1",
      "fixedVersion": "",
      "fix": "KB4556843",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556843",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 7 for x64-based Systems Service Pack 1",
      "fixedVersion": "",
      "fix": "KB4556836",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556836",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 7 for x64-based Systems Service Pack 1",
      "fixedVersion": "",
      "fix": "KB4556843",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556843",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 8.1 for 32-bit systems",
      "fixedVersion": "",
      "fix": "KB4556853",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556853",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 8.1 for 32-bit systems",
      "fixedVersion": "",
      "fix": "KB4556846",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556846",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 8.1 for x64-based systems",
      "fixedVersion": "",
      "fix": "KB4556853",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556853",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 8.1 for x64-based systems",
      "fixedVersion": "",
      "fix": "KB4556846",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556846",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows RT 8.1",
      "fixedVersion": "",
      "fix": "KB4556846",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556846",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2008 R2 for x64-based Systems Service Pack 1",
      "fixedVersion": "",
      "fix": "KB4556836",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556836",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2008 R2 for x64-based Systems Service Pack 1",
      "fixedVersion": "",
      "fix": "KB4556843",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556843",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB4556836",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556836",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB4556843",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556843",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2008 for 32-bit Systems Service Pack 2",
      "fixedVersion": "",
      "fix": "KB4556860",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556860",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2008 for 32-bit Systems Service Pack 2",
      "fixedVersion": "",
      "fix": "KB4556854",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556854",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB4556860",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556860",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB4556854",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556854",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2008 for x64-based Systems Service Pack 2",
      "fixedVersion": "",
      "fix": "KB4556860",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556860",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2008 for x64-based Systems Service Pack 2",
      "fixedVersion": "",
      "fix": "KB4556854",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556854",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB4556860",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556860",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB4556854",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556854",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2012",
      "fixedVersion": "",
      "fix": "KB4556852",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556852",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2012",
      "fixedVersion": "",
      "fix": "KB4556840",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556840",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2012 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB4556852",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556852",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2012 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB4556840",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556840",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2012 R2",
      "fixedVersion": "",
      "fix": "KB4556853",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556853",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2012 R2",
      "fixedVersion": "",
      "fix": "KB4556846",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556846",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2012 R2 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB4556853",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556853",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2012 R2 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB4556846",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556846",
      "released": "2020-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2016",
      "fixedVersion": "14393.3686",
      "fix": "KB4556813",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556813",
      "released": "2020-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2016 (Server Core installation)",
      "fixedVersion": "14393.3686",
      "fix": "KB4556813",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556813",
      "released": "2020-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2019",
      "fixedVersion": "17763.1217",
      "fix": "KB4551853",
      "url": "https://patchblox.com/security/fix/microsoft/kb4551853",
      "released": "2020-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2019 (Server Core installation)",
      "fixedVersion": "17763.1217",
      "fix": "KB4551853",
      "url": "https://patchblox.com/security/fix/microsoft/kb4551853",
      "released": "2020-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server, version 1803  (Server Core Installation)",
      "fixedVersion": "17134.1488",
      "fix": "KB4556807",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556807",
      "released": "2020-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server, version 1903 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB4556799",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556799",
      "released": "2020-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server, version 1909 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB4556799",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556799",
      "released": "2020-05-12T00:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}