{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
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      {
        "category": "self",
        "summary": "CVE-2025-23167 A flaw in Node.js 20\u0027s HTTP parser allows improper termination of HTTP/1 headers using `\\r\\n\\rX` instead of the required `\\r\\n\\r\\n`.\nThis inconsistency enables request smuggling, allowing attackers to bypass proxy-based access controls and submit unauthorized requests.\n\nThe issue was resolved by upgrading `llhttp` to version 9, which enforces correct header termination.\n\nImpact:\n* This vulnerability affects only Node.js 20.x users prior to the `llhttp` v9 upgrade. - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-23167.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "A flaw in Node.js 20\u0027s HTTP parser allows improper termination of HTTP/1 headers using `\\r\\n\\rX` instead of the required `\\r\\n\\r\\n`.\nThis inconsistency enables request smuggling, allowing attackers to bypass proxy-based access controls and submit unauthorized requests.\n\nThe issue was resolved by upgrading `llhttp` to version 9, which enforces correct header termination.\n\nImpact:\n* This vulnerability affects only Node.js 20.x users prior to the `llhttp` v9 upgrade.",
    "tracking": {
      "current_release_date": "2026-06-02T01:40:32.000Z",
      "generator": {
        "date": "2026-06-02T07:27:32.941Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2025-23167",
      "initial_release_date": "2025-05-02T00:00:00.000Z",
      "revision_history": [
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          "date": "2025-09-04T00:32:59.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
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          "date": "2025-12-06T14:36:47.000Z",
          "legacy_version": "2",
          "number": "2",
          "summary": "Information published."
        },
        {
          "date": "2025-12-07T01:45:31.000Z",
          "legacy_version": "3",
          "number": "3",
          "summary": "Information published."
        },
        {
          "date": "2026-02-21T02:58:36.000Z",
          "legacy_version": "4",
          "number": "4",
          "summary": "Information published."
        },
        {
          "date": "2026-03-31T14:54:23.000Z",
          "legacy_version": "5",
          "number": "5",
          "summary": "Information published."
        },
        {
          "date": "2026-04-29T14:46:40.000Z",
          "legacy_version": "6",
          "number": "6",
          "summary": "Information published."
        },
        {
          "date": "2026-05-31T01:40:30.000Z",
          "legacy_version": "7",
          "number": "7",
          "summary": "Information published."
        },
        {
          "date": "2026-06-02T01:40:32.000Z",
          "legacy_version": "8",
          "number": "8",
          "summary": "Information published."
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          "text": "hackerone",
          "title": "Assigning CNA"
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        {
          "category": "self",
          "summary": "CVE-2025-23167 A flaw in Node.js 20\u0027s HTTP parser allows improper termination of HTTP/1 headers using `\\r\\n\\rX` instead of the required `\\r\\n\\r\\n`.\nThis inconsistency enables request smuggling, allowing attackers to bypass proxy-based access controls and submit unauthorized requests.\n\nThe issue was resolved by upgrading `llhttp` to version 9, which enforces correct header termination.\n\nImpact:\n* This vulnerability affects only Node.js 20.x users prior to the `llhttp` v9 upgrade. - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-23167.json"
        }
      ],
      "remediations": [
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          "category": "none_available",
          "date": "2025-09-04T00:32:59.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17084-10"
          ]
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          "category": "none_available",
          "date": "2025-09-04T00:32:59.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
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          ]
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          "category": "none_available",
          "date": "2025-09-04T00:32:59.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
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          "category": "none_available",
          "date": "2025-09-04T00:32:59.000Z",
          "details": "There is no fix available for this vulnerability as of now",
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          "date": "2025-09-04T00:32:59.000Z",
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          ]
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          "category": "none_available",
          "date": "2025-09-04T00:32:59.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17086-8"
          ]
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        {
          "category": "none_available",
          "date": "2025-09-04T00:32:59.000Z",
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          "date": "2025-09-04T00:32:59.000Z",
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        },
        {
          "category": "vendor_fix",
          "date": "2025-09-04T00:32:59.000Z",
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            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "environmentalsScore": 0.0,
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "temporalScore": 6.5,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
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            "17084-13",
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            "17084-3",
            "17086-2",
            "17086-8",
            "17086-7",
            "17084-5",
            "17086-4"
          ]
        }
      ],
      "title": "A flaw in Node.js 20\u0027s HTTP parser allows improper termination of HTTP/1 headers using `\\r\\n\\rX` instead of the required `\\r\\n\\r\\n`.\nThis inconsistency enables request smuggling, allowing attackers to bypass proxy-based access controls and submit unauthorized requests.\n\nThe issue was resolved by upgrading `llhttp` to version 9, which enforces correct header termination.\n\nImpact:\n* This vulnerability affects only Node.js 20.x users prior to the `llhttp` v9 upgrade."
    }
  ]
}