Security advisory

{
  "id": "8b12d902bbf5e33c284eed3da5cc5e0e1876043c4fc6a68bd149ee4512b6baae",
  "url": "https://osv.dev/vulnerability/CVE-2021-31957",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-31957",
    "summary": "ASP.NET Core Denial of Service Vulnerability",
    "evidence": "osv:CVE-2021-31957",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-31957",
      "aliases": [
        "BIT-dotnet-2021-31957",
        "BIT-dotnet-sdk-2021-31957",
        "CVE-2021-31957"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/dotnet/core",
              "type": "GIT",
              "events": [
                {
                  "introduced": "62bcac3998e1168f4a34b775a06d6451b5ffca7b"
                },
                {
                  "last_affected": "35d4533cb92ef43d42a7d5697e5ee72f484290c3"
                },
                {
                  "introduced": "5c0a0489d157ca82fca6f9b73c682f118e8c4a8a"
                },
                {
                  "last_affected": "35d4533cb92ef43d42a7d5697e5ee72f484290c3"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "5.0"
                      },
                      {
                        "last_affected": "5.0.6"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:microsoft:.net_core:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.1"
                      },
                      {
                        "last_affected": "3.1.15"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v5.0.6",
            "v3.1.15",
            "v3.1.14",
            "v6.0.0-preview.3",
            "v5.0.5",
            "v6.0.0-preview.2",
            "v5.0.4",
            "v3.1.13",
            "v6.0.0-preview.1",
            "v5.0.3",
            "v3.1.12",
            "v2.1.25",
            "v5.0.2",
            "v3.1.11",
            "v2.1.24",
            "v5.0.1",
            "v5.0.0",
            "v3.1.10"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-31957.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:38.869171395Z",
      "provider": "osv",
      "references": [
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4PRVVLXXQEF4SEJOBV3VRJHGX7YHY2CG/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CVCDYIP4A6DDRT7G6P3ZW6PKNK2DNWJ2/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PMHWHRRYDHKM6BIINW5V7OCSW4SDWB4W/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VMAO4NG2OQ4PCXUQWMNSCMYWLIJJY6UY/",
        "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31957"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "microsoft:visual_studio_2019",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "16.0"
                  },
                  {
                    "last_affected": "16.10"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*",
              "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*"
            ],
            "vendor_product": "fedoraproject:fedora",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "33"
                  },
                  {
                    "last_affected": "33"
                  },
                  {
                    "introduced": "34"
                  },
                  {
                    "last_affected": "34"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:microsoft:visual_studio_2019:8.10:*:*:*:*:macos:*:*"
            ],
            "vendor_product": "microsoft:visual_studio_2019",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "8.10"
                  },
                  {
                    "last_affected": "8.10"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-31957",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 434552,
  "published_at": "2021-06-08T23:15:08.87+00:00"
}