FKIE_CVE-2021-42286

Vulnerability from fkie_nvd - Published: 2021-11-10 01:19 - Updated: 2026-06-17 04:09
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
Windows Core Shell SI Host Extension Framework for Composable Shell Elevation of Privilege Vulnerability
References
secure@microsoft.comhttps://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42286Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42286Patch, Vendor Advisory
Impacted products
Vendor Product Version
microsoft windows_10 20h2
microsoft windows_10 20h2
microsoft windows_10 20h2
microsoft windows_10 21h1
microsoft windows_10 21h1
microsoft windows_10 21h1
microsoft windows_10 2004
microsoft windows_10 2004
microsoft windows_10 2004
microsoft windows_server 20h2
microsoft windows_server_2016 2004
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1348:*:*:*:*:*:x64:*",
            "cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1348:*:*:*:*:*:arm64:*",
            "cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1348:*:*:*:*:*:x86:*"
          ],
          "platforms": [
            "x64-based Systems",
            "ARM64-based Systems",
            "32-bit Systems"
          ],
          "product": "Windows 10 Version 21H1",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.19043.1348",
              "status": "affected",
              "version": "10.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_10_1809:10.0.19041.1348:*:*:*:*:*:x64:*"
          ],
          "platforms": [
            "32-bit Systems",
            "ARM64-based Systems",
            "x64-based Systems"
          ],
          "product": "Windows 10 Version 2004",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.19041.1348",
              "status": "affected",
              "version": "10.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_server_2004:10.0.19041.1348:*:*:*:*:*:*:*"
          ],
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server version 2004",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.19041.1348",
              "status": "affected",
              "version": "10.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_10_20H2:10.0.19042.1348:*:*:*:*:*:x86:*",
            "cpe:2.3:o:microsoft:windows_10_20H2:10.0.19042.1348:*:*:*:*:*:arm64:*"
          ],
          "platforms": [
            "32-bit Systems",
            "ARM64-based Systems"
          ],
          "product": "Windows 10 Version 20H2",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.19042.1348",
              "status": "affected",
              "version": "10.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_server_20H2:10.0.19041.1348:*:*:*:*:*:*:*"
          ],
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server version 20H2",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.19041.1348",
              "status": "affected",
              "version": "10.0.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "secure@microsoft.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:microsoft:windows_10:20h2:*:*:*:*:*:arm64:*",
              "matchCriteriaId": "610B33F9-0309-4CF7-B7E4-5152D9B2FFE4",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_10:20h2:*:*:*:*:*:x64:*",
              "matchCriteriaId": "21074553-EDF2-468D-8E79-C39851B5BC79",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_10:20h2:*:*:*:*:*:x86:*",
              "matchCriteriaId": "4E62F9CB-D1B6-4B4D-BCCD-7F4D36A73B4D",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_10:21h1:*:*:*:*:*:arm64:*",
              "matchCriteriaId": "49A4BBDA-0389-4171-AA49-6837F7DF4454",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_10:21h1:*:*:*:*:*:x64:*",
              "matchCriteriaId": "F8C238FA-B20F-40A5-B861-A8295858F4BE",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_10:21h1:*:*:*:*:*:x86:*",
              "matchCriteriaId": "56513BCA-A9F5-4112-BDE6-77E9B8D2677E",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_10:2004:*:*:*:*:*:arm64:*",
              "matchCriteriaId": "E6132F03-DA28-4830-A69F-C2154C7FD96C",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_10:2004:*:*:*:*:*:x64:*",
              "matchCriteriaId": "09D9A720-8D3C-4699-AC57-CB4531E5BFEB",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_10:2004:*:*:*:*:*:x86:*",
              "matchCriteriaId": "BF67A7F7-466F-467D-8D2B-3273714D43C3",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_server:20h2:*:*:*:*:*:*:*",
              "matchCriteriaId": "1EAF6DBA-6E3A-4854-BFBF-B5DC36CE5929",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_server_2016:2004:*:*:*:*:*:*:*",
              "matchCriteriaId": "0B60D940-80C7-49F0-8F4E-3F99AC15FA82",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Windows Core Shell SI Host Extension Framework for Composable Shell Elevation of Privilege Vulnerability"
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de Elevaci\u00f3n de Privilegios en el Marco de Extensi\u00f3n del Host de Windows Core Shell SI para Composable Shell"
    }
  ],
  "id": "CVE-2021-42286",
  "lastModified": "2026-06-17T04:09:35.073",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "LOCAL",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 4.6,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:L/AC:L/Au:N/C:P/I:P/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 6.4,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "secure@microsoft.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-42286",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-01-05T21:27:42.688940Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2021-11-10T01:19:45.897",
  "references": [
    {
      "source": "secure@microsoft.com",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42286"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42286"
    }
  ],
  "sourceIdentifier": "secure@microsoft.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-269"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.