FKIE_CVE-2021-26423

Vulnerability from fkie_nvd - Published: 2021-08-12 18:15 - Updated: 2026-06-17 03:43
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
.NET Core and Visual Studio Denial of Service Vulnerability
References
secure@microsoft.comhttps://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26423Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26423Patch, Vendor Advisory
Impacted products
Vendor Product Version
microsoft .net *
microsoft .net_core *
microsoft .net_core *
microsoft powershell_core *
microsoft powershell_core *
microsoft visual_studio_2017 *
microsoft visual_studio_2019 *
microsoft visual_studio_2019 8.10
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:a:microsoft:visual_studio_2017:*:*:*:*:*:*:*:*"
          ],
          "platforms": [
            "Unknown"
          ],
          "product": "Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "15.9.38",
              "status": "affected",
              "version": "15.9.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*"
          ],
          "platforms": [
            "Unknown"
          ],
          "product": "Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "16.4.25",
              "status": "affected",
              "version": "16.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*"
          ],
          "platforms": [
            "Unknown"
          ],
          "product": "Microsoft Visual Studio 2019 version 16.7 (includes 16.0 \u2013 16.6)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "16.7.18",
              "status": "affected",
              "version": "16.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:a:microsoft:visual_studio_2019:16.9:*:*:*:*:*:*:*"
          ],
          "platforms": [
            "Unknown"
          ],
          "product": "Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "16.9.10",
              "status": "affected",
              "version": "15.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*"
          ],
          "platforms": [
            "Unknown"
          ],
          "product": "Microsoft Visual Studio 2019 version 16.10 (includes 16.0 - 16.9)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "16.10.5",
              "status": "affected",
              "version": "16.10.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:a:microsoft:visual_studio_2019:8.10:*:*:*:*:macos:*:*"
          ],
          "platforms": [
            "Unknown"
          ],
          "product": "Visual Studio 2019 for Mac version 8.10",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "8.10.7",
              "status": "affected",
              "version": "8.1.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:a:microsoft:.net_core:*:*:*:*:*:*:*:*"
          ],
          "platforms": [
            "Unknown"
          ],
          "product": ".NET Core 2.1",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "2.1.30",
              "status": "affected",
              "version": "2.1",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:a:microsoft:.net_core:*:*:*:*:*:*:*:*"
          ],
          "platforms": [
            "Unknown"
          ],
          "product": ".NET Core 3.1",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "3.1.18",
              "status": "affected",
              "version": "3.1",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*"
          ],
          "platforms": [
            "Unknown"
          ],
          "product": ".NET 5.0",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "5.0.9",
              "status": "affected",
              "version": "5.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:a:microsoft:powershell_core:*:*:*:*:*:*:*:*"
          ],
          "platforms": [
            "Unknown"
          ],
          "product": "PowerShell Core 7.1",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "7.1.4",
              "status": "affected",
              "version": "7.1.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:a:microsoft:powershell_core:*:*:*:*:*:*:*:*"
          ],
          "platforms": [
            "Unknown"
          ],
          "product": "PowerShell Core 7.0",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "7.0.7",
              "status": "affected",
              "version": "7.0.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "secure@microsoft.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "B85CD4C7-D84B-4C54-A604-FC852038A565",
              "versionEndIncluding": "5.0.8",
              "versionStartIncluding": "5.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:microsoft:.net_core:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "FB624437-CB1B-46A2-BF75-30035D99D2EF",
              "versionEndIncluding": "2.1.28",
              "versionStartIncluding": "2.1",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:microsoft:.net_core:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "6F344BDC-2929-4CEA-8414-E4D07C1F76F0",
              "versionEndIncluding": "3.1.17",
              "versionStartIncluding": "3.1",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:microsoft:powershell_core:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "BE4005F4-89BB-4597-9070-1137B4CEFC9B",
              "versionEndExcluding": "7.0.7",
              "versionStartIncluding": "7.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:microsoft:powershell_core:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "40F33C0C-7AF0-4B48-828C-00534012D728",
              "versionEndExcluding": "7.1.4",
              "versionStartIncluding": "7.1",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:microsoft:visual_studio_2017:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "CE03B37D-72FE-4C25-BE62-9C422AEFC80E",
              "versionEndIncluding": "15.9",
              "versionStartIncluding": "15.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "26472C42-CDB4-4176-B10B-3BF26F5030E3",
              "versionEndIncluding": "16.10",
              "versionStartIncluding": "16.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:microsoft:visual_studio_2019:8.10:*:*:*:*:macos:*:*",
              "matchCriteriaId": "BA547FFE-D557-4612-9840-EEE88ACF53AA",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": ".NET Core and Visual Studio Denial of Service Vulnerability"
    },
    {
      "lang": "es",
      "value": "Una Vulnerabilidad de Denegaci\u00f3n de Servicio en .NET Core y Visual Studio"
    }
  ],
  "id": "CVE-2021-26423",
  "lastModified": "2026-06-17T03:43:23.037",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 5.0,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "secure@microsoft.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-26423",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-06-04T13:28:43.832819Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2021-08-12T18:15:08.537",
  "references": [
    {
      "source": "secure@microsoft.com",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26423"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26423"
    }
  ],
  "sourceIdentifier": "secure@microsoft.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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Taxonomy of the tags.





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.