CVE-2025-55315 (GCVE-0-2025-55315)

Vulnerability from cvelistv5 – Published: 2025-10-14 17:00 – Updated: 2026-02-22 17:24
VLAI?
Title
ASP.NET Security Feature Bypass Vulnerability
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.
Severity ?
9.9 (Critical)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L/E:U/RL:O/RC:C
CWE
  • CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
Impacted products
Vendor Product Version
Microsoft ASP.NET Core 2.3 Affected: 2.3 , < 2.3.6 (custom)
Create a notification for this product.
Date Public ?
2025-10-14 14:00
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-55315",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-10-28T12:57:54.225931Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-10-28T12:57:58.619Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://gist.github.com/N3mes1s/d0897c13ca199e739ecc2b562f466040"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2025-10-28T20:12:31.181Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "https://andrewlock.net/understanding-the-worst-dotnet-vulnerability-request-smuggling-and-cve-2025-55315/"
          }
        ],
        "title": "CVE Program Container",
        "x_generator": {
          "engine": "ADPogram 0.0.1"
        }
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "ASP.NET Core 2.3",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "2.3.6",
              "status": "affected",
              "version": "2.3",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "ASP.NET Core 8.0",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "8.0.21",
              "status": "affected",
              "version": "8.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "ASP.NET Core 9.0",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "9.0.10",
              "status": "affected",
              "version": "9.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "Microsoft Visual Studio 2022 version 17.10",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "17.10.20",
              "status": "affected",
              "version": "17.10.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "Microsoft Visual Studio 2022 version 17.12",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "17.12.13",
              "status": "affected",
              "version": "17.12.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "Microsoft Visual Studio 2022 version 17.14",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "17.14.17",
              "status": "affected",
              "version": "17.14.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "8.0.21",
                  "versionStartIncluding": "8.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "9.0.10",
                  "versionStartIncluding": "9.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "2.3.6",
                  "versionStartIncluding": "2.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "17.12.13",
                  "versionStartIncluding": "17.12.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "17.10.20",
                  "versionStartIncluding": "17.10.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "17.14.17",
                  "versionStartIncluding": "17.14.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "datePublic": "2025-10-14T14:00:00.000Z",
      "descriptions": [
        {
          "lang": "en-US",
          "value": "Inconsistent interpretation of http requests (\u0027http request/response smuggling\u0027) in ASP.NET Core allows an authorized attacker to bypass a security feature over a network."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.9,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en-US",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-444",
              "description": "CWE-444: Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027)",
              "lang": "en-US",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-22T17:24:12.183Z",
        "orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
        "shortName": "microsoft"
      },
      "references": [
        {
          "name": "ASP.NET Security Feature Bypass Vulnerability",
          "tags": [
            "vendor-advisory",
            "patch"
          ],
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55315"
        }
      ],
      "title": "ASP.NET Security Feature Bypass Vulnerability"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
    "assignerShortName": "microsoft",
    "cveId": "CVE-2025-55315",
    "datePublished": "2025-10-14T17:00:10.371Z",
    "dateReserved": "2025-08-12T20:19:59.422Z",
    "dateUpdated": "2026-02-22T17:24:12.183Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-55315",
      "date": "2026-05-11",
      "epss": "0.01447",
      "percentile": "0.80884"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-55315\",\"sourceIdentifier\":\"secure@microsoft.com\",\"published\":\"2025-10-14T17:15:44.960\",\"lastModified\":\"2025-10-28T21:15:37.933\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Inconsistent interpretation of http requests (\u0027http request/response smuggling\u0027) in ASP.NET Core allows an authorized attacker to bypass a security feature over a network.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"secure@microsoft.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L\",\"baseScore\":9.9,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"LOW\"},\"exploitabilityScore\":3.1,\"impactScore\":6.0}]},\"weaknesses\":[{\"source\":\"secure@microsoft.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-444\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.3.0\",\"versionEndExcluding\":\"2.3.6\",\"matchCriteriaId\":\"3FFD93B1-E2BC-4183-AF00-E8076AE481EB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"8.0.0\",\"versionEndExcluding\":\"8.0.21\",\"matchCriteriaId\":\"CF3C03E8-F428-4E48-9E44-C2BFB5063C93\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"9.0.0\",\"versionEndExcluding\":\"9.0.10\",\"matchCriteriaId\":\"79900862-C5E8-49CC-B3CB-C29E8E105462\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"17.10.0\",\"versionEndExcluding\":\"17.10.20\",\"matchCriteriaId\":\"D1CC80FE-4DE3-4AC2-AB45-AEEE2A90B3ED\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"17.12.10\",\"versionEndExcluding\":\"17.12.13\",\"matchCriteriaId\":\"30CA6B37-C8AE-47E1-AC0C-64A092CD880D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"17.14.0\",\"versionEndExcluding\":\"17.14.17\",\"matchCriteriaId\":\"B906E822-E6EF-4890-A100-4BA93187BCD6\"}]}]}],\"references\":[{\"url\":\"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55315\",\"source\":\"secure@microsoft.com\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://andrewlock.net/understanding-the-worst-dotnet-vulnerability-request-smuggling-and-cve-2025-55315/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://gist.github.com/N3mes1s/d0897c13ca199e739ecc2b562f466040\",\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://andrewlock.net/understanding-the-worst-dotnet-vulnerability-request-smuggling-and-cve-2025-55315/\"}], \"x_generator\": {\"engine\": \"ADPogram 0.0.1\"}, \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-10-28T20:12:31.181Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-55315\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-10-28T12:57:54.225931Z\"}}}], \"references\": [{\"url\": \"https://gist.github.com/N3mes1s/d0897c13ca199e739ecc2b562f466040\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-10-15T13:50:13.987Z\"}}], \"cna\": {\"title\": \"ASP.NET Security Feature Bypass Vulnerability\", \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 9.9, \"baseSeverity\": \"CRITICAL\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L/E:U/RL:O/RC:C\"}, \"scenarios\": [{\"lang\": \"en-US\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"Microsoft\", \"product\": \"ASP.NET Core 2.3\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.3\", \"lessThan\": \"2.3.6\", \"versionType\": \"custom\"}]}, {\"vendor\": \"Microsoft\", \"product\": \"ASP.NET Core 8.0\", \"versions\": [{\"status\": \"affected\", \"version\": \"8.0\", \"lessThan\": \"8.0.21\", \"versionType\": \"custom\"}]}, {\"vendor\": \"Microsoft\", \"product\": \"ASP.NET Core 9.0\", \"versions\": [{\"status\": \"affected\", \"version\": \"9.0\", \"lessThan\": \"9.0.10\", \"versionType\": \"custom\"}]}, {\"vendor\": \"Microsoft\", \"product\": \"Microsoft Visual Studio 2022 version 17.10\", \"versions\": [{\"status\": \"affected\", \"version\": \"17.10.0\", \"lessThan\": \"17.10.20\", \"versionType\": \"custom\"}]}, {\"vendor\": \"Microsoft\", \"product\": \"Microsoft Visual Studio 2022 version 17.12\", \"versions\": [{\"status\": \"affected\", \"version\": \"17.12.0\", \"lessThan\": \"17.12.13\", \"versionType\": \"custom\"}]}, {\"vendor\": \"Microsoft\", \"product\": \"Microsoft Visual Studio 2022 version 17.14\", \"versions\": [{\"status\": \"affected\", \"version\": \"17.14.0\", \"lessThan\": \"17.14.17\", \"versionType\": \"custom\"}]}], \"datePublic\": \"2025-10-14T14:00:00.000Z\", \"references\": [{\"url\": \"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55315\", \"name\": \"ASP.NET Security Feature Bypass Vulnerability\", \"tags\": [\"vendor-advisory\", \"patch\"]}], \"descriptions\": [{\"lang\": \"en-US\", \"value\": \"Inconsistent interpretation of http requests (\u0027http request/response smuggling\u0027) in ASP.NET Core allows an authorized attacker to bypass a security feature over a network.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en-US\", \"type\": \"CWE\", \"cweId\": \"CWE-444\", \"description\": \"CWE-444: Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027)\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"8.0.21\", \"versionStartIncluding\": \"8.0\"}, {\"criteria\": \"cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"9.0.10\", \"versionStartIncluding\": \"9.0\"}, {\"criteria\": \"cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"2.3.6\", \"versionStartIncluding\": \"2.3\"}, {\"criteria\": \"cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"17.12.13\", \"versionStartIncluding\": \"17.12.0\"}, {\"criteria\": \"cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"17.10.20\", \"versionStartIncluding\": \"17.10.0\"}, {\"criteria\": \"cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"17.14.17\", \"versionStartIncluding\": \"17.14.0\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"shortName\": \"microsoft\", \"dateUpdated\": \"2026-02-22T17:24:12.183Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-55315\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-02-22T17:24:12.183Z\", \"dateReserved\": \"2025-08-12T20:19:59.422Z\", \"assignerOrgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"datePublished\": \"2025-10-14T17:00:10.371Z\", \"assignerShortName\": \"microsoft\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
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.