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TI-2021-13556 Aliases CVE-2021-34534GHSA-q37m-22jj-3f7x

Windows MSHTML Platform Remote Code Execution Vulnerability

Priority LOW 39Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
High
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Microsoft. Impact type from Microsoft.

Summary

Windows MSHTML Platform Remote Code Execution Vulnerability

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.02243 82nd percentileScored 2026-11-07
Fix Fixed Microsoft: 5 updates

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftWindows 10 Version 150710.0.10240.0 to before 10.0.10240.1902210.0.10240.19022Patch availableCNA
MicrosoftWindows 10 Version 160710.0.14393.0 to before 10.0.14393.458310.0.14393.4583Patch availableCNA
MicrosoftWindows 10 Version 180910.0.17763.0 to before 10.0.17763.211410.0.17763.2114Patch availableCNA
MicrosoftWindows 10 Version 180910.0.0 to before 10.0.17763.211410.0.17763.2114Patch availableCNA
MicrosoftWindows 10 Version 190910.0.0 to before 10.0.18363.173410.0.18363.1734Patch availableCNA
MicrosoftWindows 10 Version 200410.0.0 to before 10.0.19041.116510.0.19041.1165Patch availableCNA
MicrosoftWindows 10 Version 20H210.0.0 to before 10.0.19042.116510.0.19042.1165Patch availableCNA
MicrosoftWindows 10 Version 21H110.0.0 to before 10.0.19043.116510.0.19043.1165Patch availableCNA
MicrosoftWindows Server 201610.0.14393.0 to before 10.0.14393.458310.0.14393.4583Patch availableCNA
MicrosoftWindows Server 201910.0.17763.0 to before 10.0.17763.211410.0.17763.2114Patch availableCNA
  • Windows 10 Version 1507 VendorMicrosoft Affected 10.0.10240.0 to before 10.0.10240.19022 Fixed in 10.0.10240.19022 Patch available CNA
  • Windows 10 Version 1607 VendorMicrosoft Affected 10.0.14393.0 to before 10.0.14393.4583 Fixed in 10.0.14393.4583 Patch available CNA
  • Windows 10 Version 1809 VendorMicrosoft Affected 10.0.17763.0 to before 10.0.17763.2114 Fixed in 10.0.17763.2114 Patch available CNA
  • Windows 10 Version 1809 VendorMicrosoft Affected 10.0.0 to before 10.0.17763.2114 Fixed in 10.0.17763.2114 Patch available CNA
  • Windows 10 Version 1909 VendorMicrosoft Affected 10.0.0 to before 10.0.18363.1734 Fixed in 10.0.18363.1734 Patch available CNA
  • Windows 10 Version 2004 VendorMicrosoft Affected 10.0.0 to before 10.0.19041.1165 Fixed in 10.0.19041.1165 Patch available CNA
  • Windows 10 Version 20H2 VendorMicrosoft Affected 10.0.0 to before 10.0.19042.1165 Fixed in 10.0.19042.1165 Patch available CNA
  • Windows 10 Version 21H1 VendorMicrosoft Affected 10.0.0 to before 10.0.19043.1165 Fixed in 10.0.19043.1165 Patch available CNA
  • Windows Server 2016 VendorMicrosoft Affected 10.0.14393.0 to before 10.0.14393.4583 Fixed in 10.0.14393.4583 Patch available CNA
  • Windows Server 2019 VendorMicrosoft Affected 10.0.17763.0 to before 10.0.17763.2114 Fixed in 10.0.17763.2114 Patch available CNA

CPE configurations NVD · 9

CPEVersionsRoleVendor
cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:*:*not specified by NVDVulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10:20h2:*:*:*:*:*:*:*20h2VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10:21h1:*:*:*:*:*:*:*21h1VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10:1607:*:*:*:*:*:*:*1607VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10:1809:*:*:*:*:*:*:*1809VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10:1909:*:*:*:*:*:*:*1909VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10:2004:*:*:*:*:*:*:*2004VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*not specified by NVDVulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*not specified by NVDVulnerableMicrosoft
  • cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10:20h2:*:*:*:*:*:*:* Versions 20h2 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10:21h1:*:*:*:*:*:*:* Versions 21h1 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10:1607:*:*:*:*:*:*:* Versions 1607 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10:1809:*:*:*:*:*:*:* Versions 1809 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10:1909:*:*:*:*:*:*:* Versions 1909 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10:2004:*:*:*:*:*:*:* Versions 2004 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft

Remediation

Microsoft 5 updates

  • KB5005043
    Security Update
    • Windows 10 Version 1607 for 32-bit Systems 10.0.14393.4583
    • Windows 10 Version 1607 for x64-based Systems 10.0.14393.4583
    • Windows Server 2016 10.0.14393.4583
    • Windows Server 2016 (Server Core installation) 10.0.14393.4583
  • KB5005040
    Security Update
    • Windows 10 for 32-bit Systems 10.0.10240.19022
    • Windows 10 for x64-based Systems 10.0.10240.19022
  • KB5005033
    Security Update
    • Windows 10 Version 2004 for 32-bit Systems 10.0.19041.1165
    • Windows 10 Version 2004 for ARM64-based Systems 10.0.19041.1165
    • Windows 10 Version 2004 for x64-based Systems 10.0.19041.1165
    • Windows 10 Version 20H2 for 32-bit Systems 10.0.19042.1165
    • Windows 10 Version 20H2 for ARM64-based Systems 10.0.19042.1165
    • Windows 10 Version 21H1 for 32-bit Systems 10.0.19043.1165
    • Windows 10 Version 21H1 for ARM64-based Systems 10.0.19043.1165
    • Windows 10 Version 21H1 for x64-based Systems 10.0.19043.1165
    • Windows Server, version 2004 (Server Core installation) 10.0.19041.1165
    • Windows Server, version 20H2 (Server Core Installation) 10.0.19042.1165
Show 2 more Microsoft updates
  • KB5005031
    Security Update
    • Windows 10 Version 1909 for 32-bit Systems 10.0.18363.1734
    • Windows 10 Version 1909 for ARM64-based Systems 10.0.18363.1734
    • Windows 10 Version 1909 for x64-based Systems 10.0.18363.1734
  • KB5005030
    Security Update
    • Windows 10 Version 1809 for 32-bit Systems 10.0.17763.2114
    • Windows 10 Version 1809 for ARM64-based Systems 10.0.17763.2114
    • Windows 10 Version 1809 for x64-based Systems 10.0.17763.2114
    • Windows Server 2019 10.0.17763.2114
    • Windows Server 2019 (Server Core installation) 10.0.17763.2114

Vendor assessments

Microsoft

Microsoft's page for this CVE →

Impact
Remote Code Execution
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Less Likely

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-34534
  2. 2026-10-03 Alias added: GHSA-q37m-22jj-3f7x

References

Patch 2

  • TI-2015-02132 Buffer underflow in atmfd.dll in the Windows Adobe Type Manager Library in Microsoft… KEVCVSS 3.1HIGH 8.8
  • TI-2022-10056 Remote Procedure Call Runtime Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2022-06273 HTTP Protocol Stack Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2019-00906 Remote Desktop Services Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2022-15533 Windows Internet Key Exchange (IKE) Protocol Extensions Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2015-01587 Mount Manager in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows… KEVCVSS 3.1MEDIUM 6.6
See all 2973 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences