CVE-2021-33742
Windows MSHTML Platform Remote Code Execution Vulnerability
Windows MSHTML Platform Remote Code Execution Vulnerability
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Windows MSHTML Platform Remote Code Execution Vulnerability
Windows MSHTML Platform Remote Code Execution Vulnerability
- Record
CVE-2021-33742- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C - Weakness
- CWE-787
- Updated
- 2026-11-02
EUVDEUVD-2021-20419
Windows MSHTML Platform Remote Code Execution Vulnerability
- Record
EUVD-2021-20419- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-gf47-3hhj-gv96
Windows MSHTML Platform Remote Code Execution Vulnerability
Windows MSHTML Platform Remote Code Execution Vulnerability
- Record
GHSA-gf47-3hhj-gv96- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Weakness
- CWE-119, CWE-681, CWE-787
- Updated
- 2026-11-02
CISA KEV No score
Microsoft Windows MSHTML Platform Remote Code Execution Vulnerability
Microsoft Windows MSHTML Platform contains an unspecified vulnerability that allows for remote code execution.
- Record
CVE-2021-33742- Weakness
- CWE-787, CWE-823
- Updated
- 2026-11-02
NVD
Windows MSHTML Platform Remote Code Execution Vulnerability
- Record
CVE-2021-33742- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H - CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - CVSS 2.0
- 6.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:P - Weakness
- CWE-787
- Updated
- 2026-11-02
Affected products
- microsoft windows
- microsoft windows 10 version 1507
- microsoft windows 10 version 1607
- microsoft windows 10 version 1809
- microsoft windows 10 version 1909
- microsoft windows 10 version 2004
- microsoft windows 10 version 20h2
- microsoft windows 10 version 21h1
- microsoft windows 7
- microsoft windows 7 service pack 1
- microsoft windows 8.1
- microsoft windows server 2008 service pack 2
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- microsoft windows server 2008 r2 service pack 1
- microsoft windows server 2008 service pack 2
- microsoft windows server 2012
- microsoft windows server 2012 r2
- microsoft windows server 2016
- microsoft windows server 2019
- microsoft windows 10 1507
- microsoft windows 10 1607
- microsoft windows 10 1809
- microsoft windows 10 1909
- microsoft windows 10 2004
- microsoft windows 10 20h2
- microsoft windows 10 21h1
- microsoft windows rt 8.1
- microsoft windows server 2008
History
| Recorded | Changed | Sources |
|---|---|---|
| exploitation | ||
| first indexed | CVE List, EUVD, GitHub Advisories, CISA KEV, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-33742 is a high vulnerability (CVSS 7.5) in Microsoft Windows, published June 8, 2021. CISA lists it as known to be exploited, since November 3, 2021. EUVD reports exploitation since November 3, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 59.4%, the 99th percentile. No source names a fixed version.