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TI-2021-13116 Aliases CVE-2021-33742GHSA-gf47-3hhj-gv96

Windows MSHTML Platform Remote Code Execution Vulnerability

Priority CRITICAL 97Exploited in the wildCWE-787Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

Windows MSHTML Platform Remote Code Execution Vulnerability

Why it matters now

Exploitation Active In CISA KEV since 2021-11-03CISA due date 2021-11-17
EPSS 0.59407 99th percentileScored 2026-11-07
Fix Fixed Windows 10 Version 1809 (Microsoft): 10.0.17763.1999Windows Server 2019 (Microsoft): 10.0.17763.1999+15 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Active
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 180910.0.0 to before 10.0.17763.199910.0.17763.1999Patch availableCNA
MicrosoftWindows Server 201910.0.0 to before 10.0.17763.199910.0.17763.1999Patch availableCNA
MicrosoftWindows 10 Version 190910.0.0 to before 10.0.18363.162110.0.18363.1621Patch availableCNA
MicrosoftWindows 10 Version 21H110.0.0 to before 10.0.19043.105210.0.19043.1052Patch availableCNA
MicrosoftWindows 10 Version 200410.0.0 to before 10.0.19041.105210.0.19041.1052Patch availableCNA
MicrosoftWindows 10 Version 20H210.0.0 to before 10.0.19042.105210.0.19042.1052Patch availableCNA
MicrosoftWindows 10 Version 150710.0.0 to before 10.0.10240.1896710.0.10240.18967Patch availableCNA
MicrosoftWindows 10 Version 160710.0.0 to before 10.0.14393.446710.0.14393.4467Patch availableCNA
MicrosoftWindows Server 201610.0.0 to before 10.0.14393.446710.0.14393.4467Patch availableCNA
MicrosoftWindows 76.1.0 to before 6.1.7601.25632; 6.1.0 to before publication6.1.7601.25632, publicationPatch availableCNA
MicrosoftWindows 7 Service Pack 16.1.0 to before 6.1.7601.25632; 6.1.0 to before publication6.1.7601.25632, publicationPatch availableCNA
MicrosoftWindows 8.16.3.0 to before 6.3.9600.20045; 6.3.0 to before 1.0.0.06.3.9600.20045, 1.0.0.0Patch availableCNA
MicrosoftWindows Server 2008 Service Pack 26.0.0 to before 6.0.6003.21137; 6.0.0 to before publication6.0.6003.21137, publicationPatch availableCNA
MicrosoftWindows Server 2008 Service Pack 26.0.0 to before 6.0.6003.21137; 6.0.0 to before publication6.0.6003.21137, publicationPatch availableCNA
MicrosoftWindows Server 2008 R2 Service Pack 16.1.0 to before 6.1.7601.25632; 6.1.0 to before publication6.1.7601.25632, publicationPatch availableCNA
MicrosoftWindows Server 20126.2.0 to before 6.2.9200.23372; 6.2.0 to before 1.0.0.06.2.9200.23372, 1.0.0.0Patch availableCNA
MicrosoftWindows Server 2012 R26.3.0 to before 6.3.9600.20045; 6.3.0 to before 1.0.0.06.3.9600.20045, 1.0.0.0Patch availableCNA
  • Windows 10 Version 1809 VendorMicrosoft Affected 10.0.0 to before 10.0.17763.1999 Fixed in 10.0.17763.1999 Patch available CNA
  • Windows Server 2019 VendorMicrosoft Affected 10.0.0 to before 10.0.17763.1999 Fixed in 10.0.17763.1999 Patch available CNA
  • Windows 10 Version 1909 VendorMicrosoft Affected 10.0.0 to before 10.0.18363.1621 Fixed in 10.0.18363.1621 Patch available CNA
  • Windows 10 Version 21H1 VendorMicrosoft Affected 10.0.0 to before 10.0.19043.1052 Fixed in 10.0.19043.1052 Patch available CNA
  • Windows 10 Version 2004 VendorMicrosoft Affected 10.0.0 to before 10.0.19041.1052 Fixed in 10.0.19041.1052 Patch available CNA
  • Windows 10 Version 20H2 VendorMicrosoft Affected 10.0.0 to before 10.0.19042.1052 Fixed in 10.0.19042.1052 Patch available CNA
  • Windows 10 Version 1507 VendorMicrosoft Affected 10.0.0 to before 10.0.10240.18967 Fixed in 10.0.10240.18967 Patch available CNA
  • Windows 10 Version 1607 VendorMicrosoft Affected 10.0.0 to before 10.0.14393.4467 Fixed in 10.0.14393.4467 Patch available CNA
  • Windows Server 2016 VendorMicrosoft Affected 10.0.0 to before 10.0.14393.4467 Fixed in 10.0.14393.4467 Patch available CNA
  • Windows 7 VendorMicrosoft Affected 6.1.0 to before 6.1.7601.25632; 6.1.0 to before publication Fixed in 6.1.7601.25632, publication Patch available CNA
  • Windows 7 Service Pack 1 VendorMicrosoft Affected 6.1.0 to before 6.1.7601.25632; 6.1.0 to before publication Fixed in 6.1.7601.25632, publication Patch available CNA
  • Windows 8.1 VendorMicrosoft Affected 6.3.0 to before 6.3.9600.20045; 6.3.0 to before 1.0.0.0 Fixed in 6.3.9600.20045, 1.0.0.0 Patch available CNA
  • Windows Server 2008 Service Pack 2 VendorMicrosoft Affected 6.0.0 to before 6.0.6003.21137; 6.0.0 to before publication Fixed in 6.0.6003.21137, publication Patch available CNA
  • Windows Server 2008 Service Pack 2 VendorMicrosoft Affected 6.0.0 to before 6.0.6003.21137; 6.0.0 to before publication Fixed in 6.0.6003.21137, publication Patch available CNA
  • Windows Server 2008 R2 Service Pack 1 VendorMicrosoft Affected 6.1.0 to before 6.1.7601.25632; 6.1.0 to before publication Fixed in 6.1.7601.25632, publication Patch available CNA
  • Windows Server 2012 VendorMicrosoft Affected 6.2.0 to before 6.2.9200.23372; 6.2.0 to before 1.0.0.0 Fixed in 6.2.9200.23372, 1.0.0.0 Patch available CNA
  • Windows Server 2012 R2 VendorMicrosoft Affected 6.3.0 to before 6.3.9600.20045; 6.3.0 to before 1.0.0.0 Fixed in 6.3.9600.20045, 1.0.0.0 Patch available CNA

CPE configurations NVD · 16

CPEVersionsRoleVendor
cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*before 10.0.10240.18967VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:*:*before 10.0.14393.4467VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:*:*before 10.0.17763.1999VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10_1909:*:*:*:*:*:*:*:*before 10.0.18363.1621VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10_2004:*:*:*:*:*:*:*:*before 10.0.19041.1052VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10_20h2:*:*:*:*:*:*:*:*before 10.0.19042.1052VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10_21h1:*:*:*:*:*:*:*:*before 10.0.19043.1052VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:*not specified by NVDVulnerableMicrosoft
cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:*not specified by NVDVulnerableMicrosoft
cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:*not specified by NVDVulnerableMicrosoft
  • cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:* Versions before 10.0.10240.18967 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:*:* Versions before 10.0.14393.4467 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:*:* Versions before 10.0.17763.1999 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10_1909:*:*:*:*:*:*:*:* Versions before 10.0.18363.1621 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10_2004:*:*:*:*:*:*:*:* Versions before 10.0.19041.1052 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10_20h2:*:*:*:*:*:*:*:* Versions before 10.0.19042.1052 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10_21h1:*:*:*:*:*:*:*:* Versions before 10.0.19043.1052 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
Show 6 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*r2 sp1VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2008:sp2:*:*:*:*:*:*:*sp2VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*not specified by NVDVulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*r2VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*before 10.0.14393.4467VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*before 10.0.17763.1999VulnerableMicrosoft
  • cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:* Versions r2 sp1 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2008:sp2:*:*:*:*:*:*:* Versions sp2 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:* Versions r2 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:* Versions before 10.0.14393.4467 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:* Versions before 10.0.17763.1999 Vulnerable ·Microsoft

Remediation

  • Fix · CNA Windows 10 Version 1809 (Microsoft) Fixed in 10.0.17763.1999
  • Fix · CNA Windows Server 2019 (Microsoft) Fixed in 10.0.17763.1999
  • Fix · CNA Windows 10 Version 1909 (Microsoft) Fixed in 10.0.18363.1621
  • Fix · CNA Windows 10 Version 21H1 (Microsoft) Fixed in 10.0.19043.1052
  • Fix · CNA Windows 10 Version 2004 (Microsoft) Fixed in 10.0.19041.1052
  • Fix · CNA Windows 10 Version 20H2 (Microsoft) Fixed in 10.0.19042.1052
  • Fix · CNA Windows 10 Version 1507 (Microsoft) Fixed in 10.0.10240.18967
  • Fix · CNA Windows 10 Version 1607 (Microsoft) Fixed in 10.0.14393.4467
  • Fix · CNA Windows Server 2016 (Microsoft) Fixed in 10.0.14393.4467
  • Fix · CNA Windows 7 (Microsoft) Fixed in 6.1.7601.25632, publication
  • Fix · CNA Windows 7 Service Pack 1 (Microsoft) Fixed in 6.1.7601.25632, publication
  • Fix · CNA Windows 8.1 (Microsoft) Fixed in 6.3.9600.20045, 1.0.0.0
  • Fix · CNA Windows Server 2008 Service Pack 2 (Microsoft) Fixed in 6.0.6003.21137, publication
  • Fix · CNA Windows Server 2008 Service Pack 2 (Microsoft) Fixed in 6.0.6003.21137, publication
  • Fix · CNA Windows Server 2008 R2 Service Pack 1 (Microsoft) Fixed in 6.1.7601.25632, publication
  • Fix · CNA Windows Server 2012 (Microsoft) Fixed in 6.2.9200.23372, 1.0.0.0
  • Fix · CNA Windows Server 2012 R2 (Microsoft) Fixed in 6.3.9600.20045, 1.0.0.0

Timeline

  1. 2021-11-03 Added to CISA KEV
  2. 2026-10-02 Threatist record created from CVE-2021-33742
  3. 2026-10-03 Alias added: GHSA-gf47-3hhj-gv96

References

Patch 1

  • TI-2017-06077 Microsoft Windows XP SP3, Windows XP x64 XP2, Windows Server 2003 SP2, Windows Vista… KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-24062 Windows SMB Client Elevation of Privilege Vulnerability KEVCVSS 3.1HIGH 8.8
  • TI-2025-24042 Internet Shortcut Files Remote Code Execution Vulnerability KEVCVSS 3.1HIGH 8.8
  • TI-2024-32708 Windows Task Scheduler Elevation of Privilege Vulnerability KEVCVSS 3.1HIGH 8.8
  • TI-2024-29106 Windows MSHTML Platform Spoofing Vulnerability KEVCVSS 3.1HIGH 8.8
  • TI-2024-19802 Windows MSHTML Platform Security Feature Bypass Vulnerability KEVCVSS 3.1HIGH 8.8
See all 1229 →

Sources

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