{
  "document": {
    "acknowledgments": [
      {
        "names": [
          "<a href=\"https://x.com/dark_puzzle\">Souhail Hammou</a>"
        ]
      },
      {
        "names": [
          "Linzishan"
        ]
      }
    ],
    "aggregate_severity": {
      "namespace": "https://www.microsoft.com/en-us/msrc/security-update-severity-rating-system",
      "text": "Critical"
    },
    "category": "csaf_security_advisory",
    "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"
      },
      {
        "category": "general",
        "text": "Required. The vulnerability documented by this CVE requires customer action to resolve.",
        "title": "Customer Action"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-62820 Windows DNS Server Remote Code Execution Vulnerability - HTML",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62820"
      },
      {
        "category": "self",
        "summary": "CVE-2026-62820 Windows DNS Server Remote Code Execution Vulnerability - CSAF",
        "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-62820.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Exploitability Index",
        "url": "https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1"
      },
      {
        "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": "Windows DNS Server Remote Code Execution Vulnerability",
    "tracking": {
      "current_release_date": "2026-09-08T07:00:00.000Z",
      "generator": {
        "date": "2026-09-03T21:21:58.622Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-62820",
      "initial_release_date": "2026-08-11T07:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-08-11T07:00:00.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2026-09-08T07:00:00.000Z",
          "legacy_version": "1.1",
          "number": "2",
          "summary": "Updated software table to remove clients versions because this vulnerability only impacts Windows Servers. This is an informational change only."
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
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        "id": "CWE-362",
        "name": "Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"
      },
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        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        },
        {
          "category": "faq",
          "text": "Successful exploitation of this vulnerability requires an attacker to win a race condition.",
          "title": "According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?"
        },
        {
          "category": "faq",
          "text": "An unauthenticated attacker could exploit this vulnerability by sending a specially crafted packet to an affected service over the network. Successful exploitation could allow the attacker to execute code on the target system. No authentication or user interaction is required.",
          "title": "How could an attacker exploit this vulnerability?"
        }
      ],
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          "10855",
          "11571",
          "11572",
          "11923",
          "11924",
          "12436",
          "12437"
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          "2",
          "3",
          "4",
          "5",
          "6",
          "7",
          "8"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-62820 Windows DNS Server Remote Code Execution Vulnerability - HTML",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62820"
        },
        {
          "category": "self",
          "summary": "CVE-2026-62820 Windows DNS Server Remote Code Execution Vulnerability - CSAF",
          "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-62820.json"
        }
      ],
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        {
          "category": "vendor_fix",
          "date": "2026-08-11T07:00:00.000Z",
          "details": "10.0.17763.9121:Security Update:https://support.microsoft.com/help/5120238",
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            "5"
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          "url": "https://support.microsoft.com/help/5120238"
        },
        {
          "category": "vendor_fix",
          "date": "2026-08-11T07:00:00.000Z",
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            "3"
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          "url": "https://support.microsoft.com/help/5120242"
        },
        {
          "category": "vendor_fix",
          "date": "2026-08-11T07:00:00.000Z",
          "details": "10.0.20348.5440:Security Hotpatch Update:https://support.microsoft.com/help/5120229",
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            "4",
            "3"
          ],
          "url": "https://support.microsoft.com/help/5120229"
        },
        {
          "category": "vendor_fix",
          "date": "2026-08-11T07:00:00.000Z",
          "details": "10.0.26100.33296:Security Update:https://support.microsoft.com/help/5120233",
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            "2"
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        },
        {
          "category": "vendor_fix",
          "date": "2026-08-11T07:00:00.000Z",
          "details": "10.0.26100.33222:Security Hotpatch Update:https://support.microsoft.com/help/5120228",
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            "2"
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        {
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          "details": "10.0.14393.9418:Security Update:https://support.microsoft.com/help/5120418",
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            "7"
          ],
          "url": "https://support.microsoft.com/help/5120418"
        }
      ],
      "scores": [
        {
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            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "exploitCodeMaturity": "UNPROVEN",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "UNCHANGED",
            "temporalScore": 7.1,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C",
            "version": "3.1"
          },
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            "2",
            "3",
            "4",
            "5",
            "6",
            "7",
            "8"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Remote Code Execution"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely"
        }
      ],
      "title": "Windows DNS Server Remote Code Execution Vulnerability"
    }
  ]
}