CVE-2021-40444 (GCVE-0-2021-40444)

Vulnerability from cvelistv5 – Published: 2021-09-15 11:24 – Updated: 2025-10-21 23:25
VLAI? CISA
Summary
<p>Microsoft is investigating reports of a remote code execution vulnerability in MSHTML that affects Microsoft Windows. Microsoft is aware of targeted attacks that attempt to exploit this vulnerability by using specially-crafted Microsoft Office documents.</p> <p>An attacker could craft a malicious ActiveX control to be used by a Microsoft Office document that hosts the browser rendering engine. The attacker would then have to convince the user to open the malicious document. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.</p> <p>Microsoft Defender Antivirus and Microsoft Defender for Endpoint both provide detection and protections for the known vulnerability. Customers should keep antimalware products up to date. Customers who utilize automatic updates do not need to take additional action. Enterprise customers who manage updates should select the detection build 1.349.22.0 or newer and deploy it across their environments. Microsoft Defender for Endpoint alerts will be displayed as: “Suspicious Cpl File Execution”.</p> <p>Upon completion of this investigation, Microsoft will take the appropriate action to help protect our customers. This may include providing a security update through our monthly release process or providing an out-of-cycle security update, depending on customer needs.</p> <p>Please see the <strong>Mitigations</strong> and <strong>Workaround</strong> sections for important information about steps you can take to protect your system from this vulnerability.</p> <p><strong>UPDATE</strong> September 14, 2021: Microsoft has released security updates to address this vulnerability. Please see the Security Updates table for the applicable update for your system. We recommend that you install these updates immediately. Please see the FAQ for important information about which updates are applicable to your system.</p>
CWE
  • Remote Code Execution
Assigner
Impacted products
Vendor Product Version
Microsoft Windows 10 Version 1809 Affected: 10.0.0 , < 10.0.17763.2183 (custom)
    cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.2183:*:*:*:*:*:x86:*
    cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.2183:*:*:*:*:*:x64:*
    cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.2183:*:*:*:*:*:arm64:*
Create a notification for this product.
    Microsoft Windows Server 2019 Affected: 10.0.0 , < 10.0.17763.2183 (custom)
    cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.2183:*:*:*:*:*:*:*
Create a notification for this product.
    Microsoft Windows Server 2019 (Server Core installation) Affected: 10.0.0 , < 10.0.17763.2183 (custom)
    cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.2183:*:*:*:*:*:*:*
Create a notification for this product.
    Microsoft Windows 10 Version 1909 Affected: 10.0.0 , < 10.0.18363.1801 (custom)
    cpe:2.3:o:microsoft:windows_10_1909:10.0.18363.1801:*:*:*:*:*:x86:*
    cpe:2.3:o:microsoft:windows_10_1909:10.0.18363.1801:*:*:*:*:*:x64:*
    cpe:2.3:o:microsoft:windows_10_1809:10.0.18363.1801:*:*:*:*:*:x64:*
Create a notification for this product.
    Microsoft Windows 10 Version 21H1 Affected: 10.0.0 , < 10.0.19043.1237 (custom)
    cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1237:*:*:*:*:*:x64:*
    cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1237:*:*:*:*:*:arm64:*
    cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1237:*:*:*:*:*:x86:*
Create a notification for this product.
    Microsoft Windows Server 2022 Affected: 10.0.0 , < 10.0.20348.230 (custom)
    cpe:2.3:o:microsoft:windows_server_2022:10.0.20348.230:*:*:*:*:*:*:*
Create a notification for this product.
    Microsoft Windows 10 Version 2004 Affected: 10.0.0 , < 10.0.19041.1237 (custom)
    cpe:2.3:o:microsoft:windows_10_1809:10.0.19041.1237:*:*:*:*:*:x64:*
Create a notification for this product.
    Microsoft Windows Server version 2004 Affected: 10.0.0 , < 10.0.19041.1237 (custom)
    cpe:2.3:o:microsoft:windows_server_2004:10.0.19041.1237:*:*:*:*:*:*:*
Create a notification for this product.
    Microsoft Windows 10 Version 20H2 Affected: 10.0.0 , < 10.0.19042.1237 (custom)
    cpe:2.3:o:microsoft:windows_10_20H2:10.0.19042.1237:*:*:*:*:*:x86:*
    cpe:2.3:o:microsoft:windows_10_20H2:10.0.19042.1237:*:*:*:*:*:arm64:*
Create a notification for this product.
    Microsoft Windows Server version 20H2 Affected: 10.0.0 , < 10.0.19042.1237 (custom)
    cpe:2.3:o:microsoft:windows_server_20H2:10.0.19042.1237:*:*:*:*:*:*:*
Create a notification for this product.
    Microsoft Windows 10 Version 1507 Affected: 10.0.0 , < 10.0.10240.19060 (custom)
    cpe:2.3:o:microsoft:windows_10_1507:10.0.10240.19060:*:*:*:*:*:x86:*
    cpe:2.3:o:microsoft:windows_10_1507:10.0.10240.19060:*:*:*:*:*:x64:*
Create a notification for this product.
    Microsoft Windows 10 Version 1607 Affected: 10.0.0 , < 10.0.14393.4651 (custom)
    cpe:2.3:o:microsoft:windows_10_1607:10.0.14393.4651:*:*:*:*:*:x86:*
    cpe:2.3:o:microsoft:windows_10_1607:10.0.14393.4651:*:*:*:*:*:x64:*
Create a notification for this product.
    Microsoft Windows Server 2016 Affected: 10.0.0 , < 10.0.14393.4651 (custom)
    cpe:2.3:o:microsoft:windows_server_2016:10.0.14393.4651:*:*:*:*:*:*:*
Create a notification for this product.
    Microsoft Windows Server 2016 (Server Core installation) Affected: 10.0.0 , < 10.0.14393.4651 (custom)
    cpe:2.3:o:microsoft:windows_server_2016:10.0.14393.4651:*:*:*:*:*:*:*
Create a notification for this product.
    Microsoft Windows 7 Affected: 6.1.0 , < 6.1.7601.25712 (custom)
Affected: 6.1.0 , < 1.001 (custom)
Affected: 6.1.0 , < 6.1.7601.26221 (custom)
    cpe:2.3:o:microsoft:windows_7:6.1.7601.25712:sp1:*:*:*:*:x86:*
    cpe:2.3:o:microsoft:windows_7:1.001:sp1:*:*:*:*:x86:*
    cpe:2.3:o:microsoft:windows_7:6.1.7601.26221:sp1:*:*:*:*:x86:*
Create a notification for this product.
    Microsoft Windows 7 Service Pack 1 Affected: 6.1.0 , < 6.1.7601.25712 (custom)
Affected: 6.1.0 , < 1.001 (custom)
Affected: 6.1.0 , < 6.1.7601.26221 (custom)
    cpe:2.3:o:microsoft:windows_7:6.1.7601.25712:sp1:*:*:*:*:x64:*
    cpe:2.3:o:microsoft:windows_7:1.001:sp1:*:*:*:*:x64:*
    cpe:2.3:o:microsoft:windows_7:6.1.7601.26221:sp1:*:*:*:*:x64:*
Create a notification for this product.
    Microsoft Windows 8.1 Affected: 6.3.0 , < 6.3.9600.20120 (custom)
Affected: 6.3.0 , < 1.001 (custom)
    cpe:2.3:o:microsoft:windows_8.1:6.3.9600.20120:*:*:*:*:*:x86:*
    cpe:2.3:o:microsoft:windows_8.1:1.001:*:*:*:*:*:x86:*
    cpe:2.3:o:microsoft:windows_8.1:6.3.9600.20120:*:*:*:*:*:x64:*
    cpe:2.3:o:microsoft:windows_8.1:1.001:*:*:*:*:*:x64:*
    cpe:2.3:o:microsoft:windows_rt_8.1:6.3.9600.20120:*:*:*:*:*:*:*
Create a notification for this product.
    Microsoft Windows Server 2008 Service Pack 2 Affected: 6.0.0 , < 6.0.6003.21218 (custom)
Affected: 6.0.0 , < 1.001 (custom)
    cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21218:*:*:*:*:*:x64:*
    cpe:2.3:o:microsoft:windows_server_2008_sp2:1.001:*:*:*:*:*:x64:*
Create a notification for this product.
    Microsoft Windows Server 2008 Service Pack 2 (Server Core installation) Affected: 6.0.0 , < 6.0.6003.21218 (custom)
Affected: 6.0.0 , < 1.001 (custom)
    cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21218:*:*:*:*:*:x64:*
    cpe:2.3:o:microsoft:windows_server_2008_sp2:1.001:*:*:*:*:*:x64:*
    cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21218:*:*:*:*:*:x86:*
    cpe:2.3:o:microsoft:windows_server_2008_sp2:1.001:*:*:*:*:*:x86:*
Create a notification for this product.
    Microsoft Windows Server 2008 Service Pack 2 Affected: 6.0.0 , < 6.0.6003.21218 (custom)
Affected: 6.0.0 , < 1.001 (custom)
    cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21218:*:*:*:*:*:x86:*
    cpe:2.3:o:microsoft:windows_server_2008_sp2:1.001:*:*:*:*:*:x86:*
Create a notification for this product.
    Microsoft Windows Server 2008 R2 Service Pack 1 Affected: 6.1.0 , < 6.1.7601.25712 (custom)
Affected: 6.1.0 , < 1.001 (custom)
    cpe:2.3:o:microsoft:windows_server_2008_R2:6.1.7601.25712:*:*:*:*:*:x64:*
    cpe:2.3:o:microsoft:windows_server_2008_R2:1.001:*:*:*:*:*:x64:*
Create a notification for this product.
    Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation) Affected: 6.0.0 , < 6.1.7601.25712 (custom)
Affected: 6.0.0 , < 1.001 (custom)
    cpe:2.3:o:microsoft:windows_server_2008_R2:6.1.7601.25712:*:*:*:*:*:x64:*
    cpe:2.3:o:microsoft:windows_server_2008_R2:1.001:*:*:*:*:*:x64:*
Create a notification for this product.
    Microsoft Windows Server 2012 Affected: 6.2.0 , < 6.2.9200.23462 (custom)
Affected: 6.2.0 , < 1.001 (custom)
    cpe:2.3:o:microsoft:windows_server_2012:6.2.9200.23462:*:*:*:*:*:x64:*
    cpe:2.3:o:microsoft:windows_server_2012:1.001:*:*:*:*:*:x64:*
Create a notification for this product.
    Microsoft Windows Server 2012 (Server Core installation) Affected: 6.2.0 , < 6.2.9200.23462 (custom)
Affected: 6.2.0 , < 1.001 (custom)
    cpe:2.3:o:microsoft:windows_server_2012:6.2.9200.23462:*:*:*:*:*:x64:*
    cpe:2.3:o:microsoft:windows_server_2012:1.001:*:*:*:*:*:x64:*
Create a notification for this product.
    Microsoft Windows Server 2012 R2 Affected: 6.3.0 , < 6.3.9600.20120 (custom)
Affected: 6.3.0 , < 1.001 (custom)
    cpe:2.3:o:microsoft:windows_server_2012_R2:6.3.9600.20120:*:*:*:*:*:x64:*
    cpe:2.3:o:microsoft:windows_server_2012_R2:1.001:*:*:*:*:*:x64:*
Create a notification for this product.
    Microsoft Windows Server 2012 R2 (Server Core installation) Affected: 6.3.0 , < 6.3.9600.20120 (custom)
Affected: 6.3.0 , < 1.001 (custom)
    cpe:2.3:o:microsoft:windows_server_2012_R2:6.3.9600.20120:*:*:*:*:*:x64:*
    cpe:2.3:o:microsoft:windows_server_2012_R2:1.001:*:*:*:*:*:x64:*
Create a notification for this product.
CISA Known Exploited Vulnerability
Data from the CISA Known Exploited Vulnerabilities Catalog

Date added: 2021-11-03

Due date: 2021-11-17

Required action: Apply updates per vendor instructions.

Used in ransomware: Known

Notes: https://nvd.nist.gov/vuln/detail/CVE-2021-40444

Show details on NVD website

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            "url": "http://packetstormsecurity.com/files/164210/Microsoft-Windows-MSHTML-Overview.html"
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    "cna": {
      "affected": [
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.2183:*:*:*:*:*:x86:*",
            "cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.2183:*:*:*:*:*:x64:*",
            "cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.2183:*:*:*:*:*:arm64:*"
          ],
          "platforms": [
            "32-bit Systems",
            "x64-based Systems",
            "ARM64-based Systems"
          ],
          "product": "Windows 10 Version 1809",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.17763.2183",
              "status": "affected",
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        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.2183:*:*:*:*:*:*:*"
          ],
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2019",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.17763.2183",
              "status": "affected",
              "version": "10.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.2183:*:*:*:*:*:*:*"
          ],
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2019 (Server Core installation)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.17763.2183",
              "status": "affected",
              "version": "10.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_10_1909:10.0.18363.1801:*:*:*:*:*:x86:*",
            "cpe:2.3:o:microsoft:windows_10_1909:10.0.18363.1801:*:*:*:*:*:x64:*",
            "cpe:2.3:o:microsoft:windows_10_1809:10.0.18363.1801:*:*:*:*:*:x64:*"
          ],
          "platforms": [
            "32-bit Systems",
            "x64-based Systems",
            "ARM64-based Systems"
          ],
          "product": "Windows 10 Version 1909",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.18363.1801",
              "status": "affected",
              "version": "10.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1237:*:*:*:*:*:x64:*",
            "cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1237:*:*:*:*:*:arm64:*",
            "cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1237:*:*:*:*:*:x86:*"
          ],
          "platforms": [
            "x64-based Systems",
            "ARM64-based Systems",
            "32-bit Systems"
          ],
          "product": "Windows 10 Version 21H1",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.19043.1237",
              "status": "affected",
              "version": "10.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_server_2022:10.0.20348.230:*:*:*:*:*:*:*"
          ],
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2022",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.20348.230",
              "status": "affected",
              "version": "10.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_10_1809:10.0.19041.1237:*:*:*:*:*:x64:*"
          ],
          "platforms": [
            "32-bit Systems",
            "ARM64-based Systems",
            "x64-based Systems"
          ],
          "product": "Windows 10 Version 2004",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.19041.1237",
              "status": "affected",
              "version": "10.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_server_2004:10.0.19041.1237:*:*:*:*:*:*:*"
          ],
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server version 2004",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.19041.1237",
              "status": "affected",
              "version": "10.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_10_20H2:10.0.19042.1237:*:*:*:*:*:x86:*",
            "cpe:2.3:o:microsoft:windows_10_20H2:10.0.19042.1237:*:*:*:*:*:arm64:*"
          ],
          "platforms": [
            "32-bit Systems",
            "ARM64-based Systems"
          ],
          "product": "Windows 10 Version 20H2",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.19042.1237",
              "status": "affected",
              "version": "10.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_server_20H2:10.0.19042.1237:*:*:*:*:*:*:*"
          ],
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server version 20H2",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.19042.1237",
              "status": "affected",
              "version": "10.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_10_1507:10.0.10240.19060:*:*:*:*:*:x86:*",
            "cpe:2.3:o:microsoft:windows_10_1507:10.0.10240.19060:*:*:*:*:*:x64:*"
          ],
          "platforms": [
            "32-bit Systems",
            "x64-based Systems"
          ],
          "product": "Windows 10 Version 1507",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.10240.19060",
              "status": "affected",
              "version": "10.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_10_1607:10.0.14393.4651:*:*:*:*:*:x86:*",
            "cpe:2.3:o:microsoft:windows_10_1607:10.0.14393.4651:*:*:*:*:*:x64:*"
          ],
          "platforms": [
            "32-bit Systems",
            "x64-based Systems"
          ],
          "product": "Windows 10 Version 1607",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.14393.4651",
              "status": "affected",
              "version": "10.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_server_2016:10.0.14393.4651:*:*:*:*:*:*:*"
          ],
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2016",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.14393.4651",
              "status": "affected",
              "version": "10.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_server_2016:10.0.14393.4651:*:*:*:*:*:*:*"
          ],
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2016 (Server Core installation)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.14393.4651",
              "status": "affected",
              "version": "10.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_7:6.1.7601.25712:sp1:*:*:*:*:x86:*",
            "cpe:2.3:o:microsoft:windows_7:1.001:sp1:*:*:*:*:x86:*",
            "cpe:2.3:o:microsoft:windows_7:6.1.7601.26221:sp1:*:*:*:*:x86:*"
          ],
          "platforms": [
            "32-bit Systems"
          ],
          "product": "Windows 7",
          "vendor": "Microsoft",
          "versions": [
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\"cpe:2.3:o:microsoft:windows_7:1.001:sp1:*:*:*:*:x86:*\", \"cpe:2.3:o:microsoft:windows_7:6.1.7601.26221:sp1:*:*:*:*:x86:*\"], \"vendor\": \"Microsoft\", \"product\": \"Windows 7\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.1.0\", \"lessThan\": \"6.1.7601.25712\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"6.1.0\", \"lessThan\": \"1.001\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"6.1.0\", \"lessThan\": \"6.1.7601.26221\", \"versionType\": \"custom\"}], \"platforms\": [\"32-bit Systems\"]}, {\"cpes\": [\"cpe:2.3:o:microsoft:windows_7:6.1.7601.25712:sp1:*:*:*:*:x64:*\", \"cpe:2.3:o:microsoft:windows_7:1.001:sp1:*:*:*:*:x64:*\", \"cpe:2.3:o:microsoft:windows_7:6.1.7601.26221:sp1:*:*:*:*:x64:*\"], \"vendor\": \"Microsoft\", \"product\": \"Windows 7 Service Pack 1\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.1.0\", \"lessThan\": \"6.1.7601.25712\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"6.1.0\", \"lessThan\": \"1.001\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"6.1.0\", \"lessThan\": \"6.1.7601.26221\", \"versionType\": \"custom\"}], \"platforms\": [\"x64-based Systems\"]}, {\"cpes\": [\"cpe:2.3:o:microsoft:windows_8.1:6.3.9600.20120:*:*:*:*:*:x86:*\", \"cpe:2.3:o:microsoft:windows_8.1:1.001:*:*:*:*:*:x86:*\", \"cpe:2.3:o:microsoft:windows_8.1:6.3.9600.20120:*:*:*:*:*:x64:*\", \"cpe:2.3:o:microsoft:windows_8.1:1.001:*:*:*:*:*:x64:*\", \"cpe:2.3:o:microsoft:windows_rt_8.1:6.3.9600.20120:*:*:*:*:*:*:*\"], \"vendor\": \"Microsoft\", \"product\": \"Windows 8.1\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.3.0\", \"lessThan\": \"6.3.9600.20120\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"6.3.0\", \"lessThan\": \"1.001\", \"versionType\": \"custom\"}], \"platforms\": [\"32-bit Systems\", \"x64-based Systems\", \"ARM64-based Systems\"]}, {\"cpes\": [\"cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21218:*:*:*:*:*:x64:*\", \"cpe:2.3:o:microsoft:windows_server_2008_sp2:1.001:*:*:*:*:*:x64:*\"], \"vendor\": \"Microsoft\", \"product\": \"Windows Server 2008 Service Pack 2\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.0.0\", \"lessThan\": \"6.0.6003.21218\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"6.0.0\", \"lessThan\": \"1.001\", \"versionType\": \"custom\"}], \"platforms\": [\"32-bit Systems\"]}, {\"cpes\": [\"cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21218:*:*:*:*:*:x64:*\", \"cpe:2.3:o:microsoft:windows_server_2008_sp2:1.001:*:*:*:*:*:x64:*\", \"cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21218:*:*:*:*:*:x86:*\", \"cpe:2.3:o:microsoft:windows_server_2008_sp2:1.001:*:*:*:*:*:x86:*\"], \"vendor\": \"Microsoft\", \"product\": \"Windows Server 2008 Service Pack 2 (Server Core installation)\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.0.0\", \"lessThan\": \"6.0.6003.21218\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"6.0.0\", \"lessThan\": \"1.001\", \"versionType\": \"custom\"}], \"platforms\": [\"32-bit Systems\", \"x64-based Systems\"]}, {\"cpes\": [\"cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21218:*:*:*:*:*:x86:*\", \"cpe:2.3:o:microsoft:windows_server_2008_sp2:1.001:*:*:*:*:*:x86:*\"], \"vendor\": \"Microsoft\", \"product\": \"Windows Server 2008  Service Pack 2\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.0.0\", \"lessThan\": \"6.0.6003.21218\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"6.0.0\", \"lessThan\": \"1.001\", \"versionType\": \"custom\"}], \"platforms\": [\"x64-based Systems\"]}, {\"cpes\": [\"cpe:2.3:o:microsoft:windows_server_2008_R2:6.1.7601.25712:*:*:*:*:*:x64:*\", \"cpe:2.3:o:microsoft:windows_server_2008_R2:1.001:*:*:*:*:*:x64:*\"], \"vendor\": \"Microsoft\", \"product\": \"Windows Server 2008 R2 Service Pack 1\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.1.0\", \"lessThan\": \"6.1.7601.25712\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"6.1.0\", \"lessThan\": \"1.001\", \"versionType\": \"custom\"}], \"platforms\": [\"x64-based Systems\"]}, {\"cpes\": [\"cpe:2.3:o:microsoft:windows_server_2008_R2:6.1.7601.25712:*:*:*:*:*:x64:*\", \"cpe:2.3:o:microsoft:windows_server_2008_R2:1.001:*:*:*:*:*:x64:*\"], \"vendor\": \"Microsoft\", \"product\": \"Windows Server 2008 R2 Service Pack 1 (Server Core installation)\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.0.0\", \"lessThan\": \"6.1.7601.25712\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"6.0.0\", \"lessThan\": \"1.001\", \"versionType\": \"custom\"}], \"platforms\": [\"x64-based Systems\"]}, {\"cpes\": [\"cpe:2.3:o:microsoft:windows_server_2012:6.2.9200.23462:*:*:*:*:*:x64:*\", \"cpe:2.3:o:microsoft:windows_server_2012:1.001:*:*:*:*:*:x64:*\"], \"vendor\": \"Microsoft\", \"product\": \"Windows Server 2012\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.2.0\", \"lessThan\": \"6.2.9200.23462\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"6.2.0\", \"lessThan\": \"1.001\", \"versionType\": \"custom\"}], \"platforms\": [\"x64-based Systems\"]}, {\"cpes\": [\"cpe:2.3:o:microsoft:windows_server_2012:6.2.9200.23462:*:*:*:*:*:x64:*\", \"cpe:2.3:o:microsoft:windows_server_2012:1.001:*:*:*:*:*:x64:*\"], \"vendor\": \"Microsoft\", \"product\": \"Windows Server 2012 (Server Core installation)\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.2.0\", \"lessThan\": \"6.2.9200.23462\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"6.2.0\", \"lessThan\": \"1.001\", \"versionType\": \"custom\"}], \"platforms\": [\"x64-based Systems\"]}, {\"cpes\": [\"cpe:2.3:o:microsoft:windows_server_2012_R2:6.3.9600.20120:*:*:*:*:*:x64:*\", \"cpe:2.3:o:microsoft:windows_server_2012_R2:1.001:*:*:*:*:*:x64:*\"], \"vendor\": \"Microsoft\", \"product\": \"Windows Server 2012 R2\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.3.0\", \"lessThan\": \"6.3.9600.20120\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"6.3.0\", \"lessThan\": \"1.001\", \"versionType\": \"custom\"}], \"platforms\": [\"x64-based Systems\"]}, {\"cpes\": [\"cpe:2.3:o:microsoft:windows_server_2012_R2:6.3.9600.20120:*:*:*:*:*:x64:*\", \"cpe:2.3:o:microsoft:windows_server_2012_R2:1.001:*:*:*:*:*:x64:*\"], \"vendor\": \"Microsoft\", \"product\": \"Windows Server 2012 R2 (Server Core installation)\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.3.0\", \"lessThan\": \"6.3.9600.20120\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"6.3.0\", \"lessThan\": \"1.001\", \"versionType\": \"custom\"}], \"platforms\": [\"x64-based Systems\"]}], \"datePublic\": \"2021-09-07T07:00:00.000Z\", \"references\": [{\"url\": \"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40444\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"http://packetstormsecurity.com/files/164210/Microsoft-Windows-MSHTML-Overview.html\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"http://packetstormsecurity.com/files/165214/Microsoft-Office-Word-MSHTML-Remote-Code-Execution.html\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"http://packetstormsecurity.com/files/167317/Microsoft-Office-MSDT-Follina-Proof-Of-Concept.html\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en-US\", \"value\": \"\u003cp\u003eMicrosoft is investigating reports of a remote code execution vulnerability in MSHTML that affects Microsoft Windows. Microsoft is aware of targeted attacks that attempt to exploit this vulnerability by using specially-crafted Microsoft Office documents.\u003c/p\u003e\\n\u003cp\u003eAn attacker could craft a malicious ActiveX control to be used by a Microsoft Office document that hosts the browser rendering engine. The attacker would then have to convince the user to open the malicious document. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.\u003c/p\u003e\\n\u003cp\u003eMicrosoft Defender Antivirus and Microsoft Defender for Endpoint both provide detection and protections for the known vulnerability. Customers should keep antimalware products up to date. Customers who utilize automatic updates do not need to take additional action. Enterprise customers who manage updates should select the detection build 1.349.22.0 or newer and deploy it across their environments. Microsoft Defender for Endpoint alerts will be displayed as: \\u201cSuspicious Cpl File Execution\\u201d.\u003c/p\u003e\\n\u003cp\u003eUpon completion of this investigation, Microsoft will take the appropriate action to help protect our customers. This may include providing a security update through our monthly release process or providing an out-of-cycle security update, depending on customer needs.\u003c/p\u003e\\n\u003cp\u003ePlease see the \u003cstrong\u003eMitigations\u003c/strong\u003e and \u003cstrong\u003eWorkaround\u003c/strong\u003e sections for important information about steps you can take to protect your system from this vulnerability.\u003c/p\u003e\\n\u003cp\u003e\u003cstrong\u003eUPDATE\u003c/strong\u003e September 14, 2021: Microsoft has released security updates to address this vulnerability. Please see the Security Updates table for the applicable update for your system. We recommend that you install these updates immediately. Please see the FAQ for important information about which updates are applicable to your system.\u003c/p\u003e\\n\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en-US\", \"type\": \"Impact\", \"description\": \"Remote Code Execution\"}]}], \"providerMetadata\": {\"orgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"shortName\": \"microsoft\", \"dateUpdated\": \"2023-12-28T19:37:23.721Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-40444\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-10-21T18:49:42.176Z\", \"dateReserved\": \"2021-09-02T00:00:00.000Z\", \"assignerOrgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"datePublished\": \"2021-09-15T11:24:26.000Z\", \"assignerShortName\": \"microsoft\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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Detection rules are retrieved from Rulezet.

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