Security advisory

{
  "id": "65f6bec059e4d206ceb30d904b584cec5e75d38e19ab284de3b7d24bf0a0f4db",
  "url": "https://osv.dev/vulnerability/CVE-2025-55315",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2025-55315",
    "summary": "Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an authorized attacker to bypass a security feature over a network.",
    "evidence": "osv:CVE-2025-55315",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2025-55315",
      "aliases": [
        "BIT-aspnet-core-2025-55315",
        "CVE-2025-55315",
        "GHSA-5rrx-jjjq-q2r5"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/dotnet/aspnetcore",
              "type": "GIT",
              "events": [
                {
                  "introduced": "3f1acb59718cadf111a0a796681e3d3509bb3381"
                },
                {
                  "fixed": "6254f5ca64f85b90327592dff67ea6b2ec0262c6"
                },
                {
                  "introduced": "af22effae4069a5dfb9b0735859de48820104f5b"
                },
                {
                  "fixed": "5bae930797f60d2d04f3b1df6a33eaca85fc5f28"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "8.0.0"
                      },
                      {
                        "fixed": "8.0.21"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "9.0.0"
                      },
                      {
                        "fixed": "9.0.10"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v8.0.20",
            "v8.0.19",
            "v8.0.18",
            "v8.0.17",
            "v8.0.16",
            "v8.0.15",
            "v8.0.14",
            "v8.0.13",
            "v8.0.12",
            "v8.0.11",
            "v8.0.10",
            "v8.0.8",
            "v8.0.7",
            "v8.0.5",
            "v8.0.4",
            "v8.0.3",
            "v8.0.2",
            "v8.0.1",
            "v8.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-55315.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:39.513032936Z",
      "provider": "osv",
      "references": [
        "https://andrewlock.net/understanding-the-worst-dotnet-vulnerability-request-smuggling-and-cve-2025-55315/",
        "https://gist.github.com/N3mes1s/d0897c13ca199e739ecc2b562f466040",
        "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55315"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "microsoft:asp.net_core",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "2.3.0"
                  },
                  {
                    "fixed": "2.3.6"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "microsoft:visual_studio_2022",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "17.10.0"
                  },
                  {
                    "fixed": "17.10.20"
                  },
                  {
                    "introduced": "17.12.10"
                  },
                  {
                    "fixed": "17.12.13"
                  },
                  {
                    "introduced": "17.14.0"
                  },
                  {
                    "fixed": "17.14.17"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-55315",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 434690,
  "published_at": "2025-10-14T17:15:44.96+00:00"
}