CVE-2021-34447
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
- None
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-2021-34447- CVSS 3.1
- 6.8 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C - Updated
- 2026-11-02
EUVDEUVD-2021-21102
Windows MSHTML Platform Remote Code Execution Vulnerability
- Record
EUVD-2021-21102- CVSS 3.1
- 6.8 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-jrwr-qw3f-xrg9
Windows MSHTML Platform Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021...
Windows MSHTML Platform Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021-34497.
- Record
GHSA-jrwr-qw3f-xrg9- CVSS 3.1
- 6.8 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N - Updated
- 2026-11-02
NVD
Windows MSHTML Platform Remote Code Execution Vulnerability
- Record
CVE-2021-34447- CVSS 3.1
- 6.8 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N - 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 - Updated
- 2026-11-02
Affected products
- 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 r2 service pack 1
- microsoft windows server 2008 service pack 2
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-34447 is a medium vulnerability (CVSS 6.8) in Microsoft Windows 10 Version 1507, published July 16, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.04%, the 81st percentile. No source names a fixed version.