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Windows MSHTML Platform

CVE-2021-41342 — Windows MSHTML Platform Remote Code Execution Vulnerability

Important CVSS 6.8 EPSS 0.01541 2021-10 archive

Executive Summary

None

Overview

6.8
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Remote Code Execution
Released Oct 12 2021
Last Updated Oct 12 2021
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.01541 — 0.71658 percentile
NVD CVSS 6.8 MEDIUM — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:P/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
High
PRIVILEGES REQUIRED
None
USER INTERACTION
Required
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
None
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.1

EPSS Score

0.01541
probability of exploitation in the next 30 days
0.71658 percentile - updated 2026-06-21
View on FIRST.org

Affected Products

24 affected products
Product KB Article Severity Impact Restart Required
Windows 10 for 32-bit Systems 5006675 (Security Update) Important Remote Code Execution Yes
Windows 10 for x64-based Systems 5006675 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 1607 for 32-bit Systems 5006669 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 1607 for x64-based Systems 5006669 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 1809 for 32-bit Systems 5006672 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 1809 for ARM64-based Systems 5006672 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 1809 for x64-based Systems 5006672 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 1909 for 32-bit Systems 5006667 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 1909 for ARM64-based Systems 5006667 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 1909 for x64-based Systems 5006667 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 2004 for 32-bit Systems 5006670 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 2004 for ARM64-based Systems 5006670 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 2004 for x64-based Systems 5006670 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 20H2 for 32-bit Systems 5006670 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 20H2 for ARM64-based Systems 5006670 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 21H1 for 32-bit Systems 5006670 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 21H1 for ARM64-based Systems 5006670 (Security Update) Important Remote Code Execution Yes
Windows 10 Version 21H1 for x64-based Systems 5006670 (Security Update) Important Remote Code Execution Yes
Windows 11 version 21H2 for ARM64-based Systems 5006674 (Security Update) Important Remote Code Execution Yes
Windows 11 version 21H2 for x64-based Systems 5006674 (Security Update) Important Remote Code Execution Yes
Windows 7 for 32-bit Systems Service Pack 1 5006743 (Monthly Rollup) 5006671 (IE Cumulative) Important Remote Code Execution 5005633 5005563 Base: 6.8 Temporal: 6.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:P/RL:O/RC:C 6.1.7601.25740 1.001 Yes 5006743 Windows 7 for x64-based Systems Service Pack 1 5006743 (Monthly Rollup) 5006671 (IE Cumulative) Important Remote Code Execution 5005633 5005563 Base: 6.8 Temporal: 6.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:P/RL:O/RC:C 6.1.7601.25740 1.001 Yes 5006743 Windows 8.1 for 32-bit systems 5006671 (IE Cumulative) 5006714 (Monthly Rollup) Important Remote Code Execution 5005563 5005613 Base: 6.8 Temporal: 6.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:P/RL:O/RC:C 1.001 6.3.9600.20144 Yes 5006714 Windows 8.1 for x64-based systems 5006671 (IE Cumulative) 5006714 (Monthly Rollup) Important Remote Code Execution 5005563 5005613 Base: 6.8 Temporal: 6.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:P/RL:O/RC:C 1.001 6.3.9600.20144 Yes 5006714 Windows RT 8.1 5006714 (Monthly Rollup) Important Remote Code Execution Yes
Windows Server 2008 for 32-bit Systems Service Pack 2 5006671 (IE Cumulative) 5006736 (Monthly Rollup) Important Remote Code Execution 5005563 5005606 Base: 6.8 Temporal: 6.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:P/RL:O/RC:C 1.001 6.0.6003.21251 Yes 5006736 Windows Server 2008 for x64-based Systems Service Pack 2 5006671 (IE Cumulative) 5006736 (Monthly Rollup) Important Remote Code Execution 5005563 5005606 Base: 6.8 Temporal: 6.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:P/RL:O/RC:C 1.001 6.0.6003.21251 Yes 5006736 Windows Server 2008 R2 for x64-based Systems Service Pack 1 5006743 (Monthly Rollup) 5006671 (IE Cumulative) Important Remote Code Execution 5005633 5005563 Base: 6.8 Temporal: 6.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:P/RL:O/RC:C 6.1.7601.25740 1.001 Yes 5006743 Windows Server 2012 5006671 (IE Cumulative) 5006739 (Monthly Rollup) Important Remote Code Execution 5005563 5005623 Base: 6.8 Temporal: 6.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:P/RL:O/RC:C 1.001 6.2.9200.23490 Yes 5006739 Windows Server 2012 R2 5006671 (IE Cumulative) 5006714 (Monthly Rollup) Important Remote Code Execution 5005563 5005613 Base: 6.8 Temporal: 6.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:P/RL:O/RC:C 1.001 6.3.9600.20144 Yes 5006714 Windows Server 2016 5006669 (Security Update) Important Remote Code Execution Yes
Windows Server 2019 5006672 (Security Update) Important Remote Code Execution Yes
Windows Server 2022 5006699 (Security Update) Important Remote Code Execution Yes

Patches

8 patches
Article Type Restart
5006675 Security Update Yes
5006669 Security Update Yes
5006672 Security Update Yes
5006667 Security Update Yes
5006670 Security Update Yes
5006674 Security Update Yes
5006714 Monthly Rollup Yes
5006699 Security Update Yes

Known Exploits

Acknowledgments

j00sean

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