{
  "document": {
    "acknowledgments": [
      {
        "names": [
          "Quan Luo from Codesafe Team of Legendsec at Qi\u0027anxin Group"
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        "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.",
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        "text": "Required. The vulnerability documented by this CVE requires customer action to resolve.",
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        "category": "self",
        "summary": "CVE-2021-26424 Windows TCP/IP Remote Code Execution Vulnerability - HTML",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26424"
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    {
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      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        },
        {
          "category": "faq",
          "text": "This vulnerability is remotely triggerable by a malicious Hyper-V guest that sends an ipv6 ping to the Hyper-V host. An attacker could send a specially crafted TCPIP packet to its host utilizing the TCPIP Protocol Stack (tcpip.sys) to process packets.\nThis attack is specific to Hyper-V. Systems that do not have Hyper-V installed are not at risk.\nYes. Disabling IPV6 will block the threat vector. See Guidance for configuring IPv6 in Windows for advanced users for instructions for disabling IPV6.",
          "title": "How could an attacker exploit this vulnerability?"
        }
      ],
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        {
          "category": "self",
          "summary": "CVE-2021-26424 Windows TCP/IP Remote Code Execution Vulnerability - HTML",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26424"
        },
        {
          "category": "self",
          "summary": "CVE-2021-26424 Windows TCP/IP Remote Code Execution Vulnerability - CSAF",
          "url": "https://msrc.microsoft.com/csaf/advisories/2021/msrc_cve-2021-26424.json"
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          "url": "https://support.microsoft.com/help/5005094"
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.9,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "environmentalScore": 0.0,
            "exploitCodeMaturity": "UNPROVEN",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "CHANGED",
            "temporalScore": 8.6,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C",
            "version": "3.1"
          },
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Remote Code Execution"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation More Likely;Older Software Release:Exploitation More Likely"
        }
      ],
      "title": "Windows TCP/IP Remote Code Execution Vulnerability"
    }
  ]
}