{
  "document": {
    "acknowledgments": [
      {
        "names": [
          "Zhiniang Peng (<a href=\"https://twitter.com/edwardzpeng/\">@edwardzpeng</a>) and Xuefeng Li (<a href=\"https://twitter.com/lxf02942370/\">@lxf02942370</a>)"
        ]
      },
      {
        "names": [
          "Sergii Bezus with <a href=\"https://10guards.com\">10Guards</a>"
        ]
      }
    ],
    "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-2021-34527 Windows Print Spooler Remote Code Execution Vulnerability - HTML",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34527"
      },
      {
        "category": "self",
        "summary": "CVE-2021-34527 Windows Print Spooler Remote Code Execution Vulnerability - CSAF",
        "url": "https://msrc.microsoft.com/csaf/advisories/2021/msrc_cve-2021-34527.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 Print Spooler Remote Code Execution Vulnerability",
    "tracking": {
      "current_release_date": "2023-06-13T07:00:00.000Z",
      "generator": {
        "date": "2026-08-10T15:10:54.793Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
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      "id": "msrc_CVE-2021-34527",
      "initial_release_date": "2021-07-01T07:00:00.000Z",
      "revision_history": [
        {
          "date": "2021-07-01T07:00:00.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2021-07-02T07:00:00.000Z",
          "legacy_version": "1.3",
          "number": "2",
          "summary": "Updated FAQ information. This is an informational change only."
        },
        {
          "date": "2021-07-02T07:00:00.000Z",
          "legacy_version": "1.1",
          "number": "3",
          "summary": "The information in the workaround section was updated. This an informational change only."
        },
        {
          "date": "2021-07-02T07:00:00.000Z",
          "legacy_version": "1.2",
          "number": "4",
          "summary": "CVE revised to update the FAQ, add a mitigation, and add the CVSS score. These are informational changes only."
        },
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          "date": "2021-07-03T07:00:00.000Z",
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          "number": "5",
          "summary": "Updated FAQ information. This is an informational change only."
        },
        {
          "date": "2021-07-06T07:00:00.000Z",
          "legacy_version": "2",
          "number": "6",
          "summary": "CVE updated to announce that Microsoft is releasing an update for several versions of Window to address this vulnerability. Updates are not yet available for Windows 10 version 1607, Windows Server 2016, or Windows Server 2012. Security updates for these versions of Windows will be released soon. Other information has been updated as well. This information will be updated when more information or updates are available."
        },
        {
          "date": "2021-07-07T07:00:00.000Z",
          "legacy_version": "3",
          "number": "7",
          "summary": "CVE updated to announce that Microsoft is releasing an update for Windows 10 version 1607, Windows Server 2016, and Windows Server 2012.  Other information has been updated as well."
        },
        {
          "date": "2021-07-08T07:00:00.000Z",
          "legacy_version": "3.1",
          "number": "8",
          "summary": "Added information to the executive summary and the FAQ sections. This is an informational change only."
        },
        {
          "date": "2021-07-15T07:00:00.000Z",
          "legacy_version": "3.2",
          "number": "9",
          "summary": "Added FAQ information. This is an informational change only."
        },
        {
          "date": "2021-07-16T07:00:00.000Z",
          "legacy_version": "3.3",
          "number": "10",
          "summary": "Added an acknowledgement. This is an informational change only."
        },
        {
          "date": "2023-06-13T07:00:00.000Z",
          "legacy_version": "3.4",
          "number": "11",
          "summary": "In the Security Updates table, added all supported editions of Windows 10 version 21H2, Windows 11 version 21H2, Windows 11 version 22H2, and Windows Server 2022 as they are affected by this vulnerability. Customers running any of these versions of Windows should install listed updates or newer to be protected from this vulnerability. After these updates are installed, please follow the advice included in the documentation on this CVE.&nbsp; With this revision, products that are no longer in support have been removed."
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  "vulnerabilities": [
    {
      "cve": "CVE-2021-34527",
      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        },
        {
          "category": "faq",
          "text": "All monthly security updates are cumulative, including the monthly security updates released on July 13, 2021. The July 13, 2021 cumulative security updates contain all previous security fixes - including the security fix for the print spooler vulnerability (CVE-2021-34527). Customers who have not previously deployed the OOB fix released on July 6 and 7, 2021, can skip deploying the OOB update and deploy the July cumulative security updates released on July 13, 2021, to be protected.\nYes, Microsoft has assigned CVE-2021-34527 to this vulnerability.\nThis vulnerability is similar but distinct from the vulnerability that is assigned CVE-2021-1675.  The attack vector is different as well. CVE-2021-1675 was addressed by the security update released on June 8, 2021.\nNo, the vulnerability existed before the June 8, 2021 security update.\nAll versions of Windows are vulnerable. As of July 7, 2021, Microsoft has released security updates for this vulnerability for all supported versions of Windows listed in the security updates table in this CVE.\nThe security updates released on and after July 6, 2021 contain protections for a remote code execution exploit in the Windows Print Spooler service known as “PrintNightmare”, documented in CVE-2021-34527, as well as for CVE-2021-1675.\nDomain controllers are affected if the print spooler service is enabled.\nYes. All editions of Windows are affected.\nSecurity products, like Microsoft 365 Defender, offer different ways to view relevant alerts and telemetry. Microsoft has published our recommendations for seeing this sort of behavior at our GitHub here: Microsoft 365 Defender Hunting Queries. Customers using other technologies can adapt this logic for use in their environments.\nPoint and Print is not directly related to this vulnerability, but certain configurations make systems vulnerable to exploitation.\nPlease see  KB5005010: Restricting installation of new printer drivers after applying the July 6, 2021 updates for complete information.\nPlease see  KB5005010: Restricting installation of new printer drivers after applying the July 6, 2021 updates for complete information.",
          "title": "If I have not yet installed the security update released Out-of-Band on July 6 and 7, 2021, then do I need to install both the Out-of-Band security update released on July 6 and 7, 2021, and the monthly security updates released on July 13, 2021 to be protected from PrintNightmare?"
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          "summary": "CVE-2021-34527 Windows Print Spooler Remote Code Execution Vulnerability - HTML",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34527"
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            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "environmentalScore": 0.0,
            "exploitCodeMaturity": "FUNCTIONAL",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "UNCHANGED",
            "temporalScore": 8.2,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C",
            "version": "3.1"
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      "threats": [
        {
          "category": "impact",
          "details": "Remote Code Execution"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:Yes;Exploited:Yes;Latest Software Release:Exploitation Detected;Older Software Release:Exploitation Detected"
        }
      ],
      "title": "Windows Print Spooler Remote Code Execution Vulnerability"
    }
  ]
}