{
  "document": {
    "acknowledgments": [
      {
        "names": [
          "James Forshaw of Google Project Zero with "
        ]
      }
    ],
    "aggregate_severity": {
      "namespace": "https://www.microsoft.com/en-us/msrc/security-update-severity-rating-system",
      "text": "Important"
    },
    "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-2021-34470 Microsoft Exchange Server Elevation of Privilege Vulnerability - HTML",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34470"
      },
      {
        "category": "self",
        "summary": "CVE-2021-34470 Microsoft Exchange Server Elevation of Privilege Vulnerability - CSAF",
        "url": "https://msrc.microsoft.com/csaf/advisories/2021/msrc_cve-2021-34470.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": "Microsoft Exchange Server Elevation of Privilege Vulnerability",
    "tracking": {
      "current_release_date": "2021-07-13T07:00:00.000Z",
      "generator": {
        "date": "2026-08-10T15:10:54.790Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2021-34470",
      "initial_release_date": "2021-07-13T07:00:00.000Z",
      "revision_history": [
        {
          "date": "2021-07-13T07:00:00.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c15.00.1497.023",
            "product": {
              "name": "Microsoft Exchange Server 2013 Cumulative Update 23 \u003c15.00.1497.023",
              "product_id": "3"
            }
          },
          {
            "category": "product_version",
            "name": "15.00.1497.023",
            "product": {
              "name": "Microsoft Exchange Server 2013 Cumulative Update 23 15.00.1497.023",
              "product_id": "11682"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft Exchange Server 2013 Cumulative Update 23"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c15.02.0922.007",
            "product": {
              "name": "Microsoft Exchange Server 2019 Cumulative Update 10 \u003c15.02.0922.007",
              "product_id": "1"
            }
          },
          {
            "category": "product_version",
            "name": "15.02.0922.007",
            "product": {
              "name": "Microsoft Exchange Server 2019 Cumulative Update 10 15.02.0922.007",
              "product_id": "11908"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft Exchange Server 2019 Cumulative Update 10"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c15.01.2308.008",
            "product": {
              "name": "Microsoft Exchange Server 2016 Cumulative Update 21 \u003c15.01.2308.008",
              "product_id": "2"
            }
          },
          {
            "category": "product_version",
            "name": "15.01.2308.008",
            "product": {
              "name": "Microsoft Exchange Server 2016 Cumulative Update 21 15.01.2308.008",
              "product_id": "11906"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft Exchange Server 2016 Cumulative Update 21"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2021-34470",
      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        },
        {
          "category": "faq",
          "text": "This vulnerability involved a schema change and therefore needed to be fixed in a cumulative update.  For these versions, this vulnerability was addressed in the cumulative updated released on June 29, 2021.",
          "title": "Why are the links to the download center and KB articles for the CVE pointing to the June Cumulative Update for Exchange Server 2019 and Exchange Server 2016?"
        },
        {
          "category": "faq",
          "text": "This vulnerability\u0027s attack is limited at the protocol level to a logically adjacent topology. This means it cannot simply be done across the internet, but instead needs something specific tied to the target. Good examples would include the same shared physical network (such as Bluetooth or IEEE 802.11), logical network (local IP subnet), or from within a secure or otherwise limited administrative domain (MPLS, secure VPN to an administrative network zone). This is common to many attacks that require machine-in-the-middle (MITM) type setups or that rely on initially gaining a foothold in another environment.",
          "title": "According to the CVSS metric, the attack vector is adjacent (AV:A). What does that mean for this vulnerability?"
        }
      ],
      "product_status": {
        "fixed": [
          "11682",
          "11906",
          "11908"
        ],
        "known_affected": [
          "1",
          "2",
          "3"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2021-34470 Microsoft Exchange Server Elevation of Privilege Vulnerability - HTML",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34470"
        },
        {
          "category": "self",
          "summary": "CVE-2021-34470 Microsoft Exchange Server Elevation of Privilege Vulnerability - CSAF",
          "url": "https://msrc.microsoft.com/csaf/advisories/2021/msrc_cve-2021-34470.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2021-07-13T07:00:00.000Z",
          "details": "15.00.1497.023:Security Update:https://support.microsoft.com/help/5004778",
          "product_ids": [
            "3"
          ],
          "url": "https://support.microsoft.com/help/5004778"
        },
        {
          "category": "vendor_fix",
          "date": "2021-07-13T07:00:00.000Z",
          "details": "15.02.0922.007:Security Update:https://support.microsoft.com/help/5003612",
          "product_ids": [
            "1"
          ],
          "url": "https://support.microsoft.com/help/5003612"
        },
        {
          "category": "vendor_fix",
          "date": "2021-07-13T07:00:00.000Z",
          "details": "15.01.2308.008:Security Update:https://support.microsoft.com/help/5003611",
          "product_ids": [
            "2"
          ],
          "url": "https://support.microsoft.com/help/5003611"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.0,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "environmentalScore": 0.0,
            "exploitCodeMaturity": "UNPROVEN",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "UNCHANGED",
            "temporalScore": 7.0,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "1",
            "2",
            "3"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Elevation of Privilege"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely;Older Software Release:Exploitation Less Likely"
        }
      ],
      "title": "Microsoft Exchange Server Elevation of Privilege Vulnerability"
    }
  ]
}