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CVE-2021-33742

89
FAUCET Score

CVE-2021-33742 is a critical remote code execution vulnerability affecting the Windows MSHTML Platform. This flaw allows an unauthenticated attacker to execute arbitrary code on a vulnerable system with high impact on confidentiality, integrity, and availability, requiring user interaction. It has a CVSS score of 8.8 (HIGH) and is actively exploited in the wild, as confirmed by its presence in the KEV catalog. Despite no public exploit code in Metasploit, Nuclei, or ExploitDB, it garners significant community discussion and media coverage, indicating widespread awareness and concern.

Impacted Technologies

VendorProductVersion(s)CPE
< 10.0.10240.18967CPE matchmatch criteria
cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*
< 10.0.14393.4467CPE matchmatch criteria
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:*:*
< 10.0.17763.1999CPE matchmatch criteria
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:*:*
< 10.0.18363.1621CPE matchmatch criteria
cpe:2.3:o:microsoft:windows_10_1909:*:*:*:*:*:*:*:*
< 10.0.19041.1052CPE matchmatch criteria
cpe:2.3:o:microsoft:windows_10_2004:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.6
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
59.14%
Probability of exploitation in next 30 days
EPSS Percentile
99.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
Added to KEV · Nov 3, 2021
This CVE's current EPSS score of 0.5914 is in the 99th percentile among its peer group of 14,875 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (40)

microsoftpatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1809 for 32-bit SystemsFixed in: 10.0.17763.1999
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1809 for x64-based SystemsFixed in: 10.0.17763.1999
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1809 for ARM64-based SystemsFixed in: 10.0.17763.1999
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2019Fixed in: 10.0.17763.1999
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1909 for 32-bit SystemsFixed in: 10.0.18363.1621
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1909 for x64-based SystemsFixed in: 10.0.18363.1621
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1909 for ARM64-based SystemsFixed in: 10.0.18363.1621
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 21H1 for x64-based SystemsFixed in: 10.0.19043.1052
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 21H1 for ARM64-based SystemsFixed in: 10.0.19043.1052
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 21H1 for 32-bit SystemsFixed in: 10.0.19043.1052
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 2004 for 32-bit SystemsFixed in: 10.0.19041.1052
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 2004 for ARM64-based SystemsFixed in: 10.0.19041.1052
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 2004 for x64-based SystemsFixed in: 10.0.19041.1052
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 20H2 for 32-bit SystemsFixed in: 10.0.19042.1052
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 20H2 for ARM64-based SystemsFixed in: 10.0.19042.1052
View patch
microsoftpatch availablevia msrc
Product: Windows 10 for 32-bit SystemsFixed in: 10.0.10240.18967
View patch
microsoftpatch availablevia msrc
Product: Windows 10 for x64-based SystemsFixed in: 10.0.10240.18967
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1607 for 32-bit SystemsFixed in: 10.0.14393.4467
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1607 for x64-based SystemsFixed in: 10.0.14393.4467
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2016Fixed in: 10.0.14393.4467
View patch
microsoftpatch availablevia msrc
Product: Windows 7 for 32-bit Systems Service Pack 1Fixed in: 6.1.7601.25632
View patch
microsoftpatch availablevia msrc
Product: Windows 7 for x64-based Systems Service Pack 1Fixed in: 6.1.7601.25632
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2008 R2 for x64-based Systems Service Pack 1Fixed in: 6.1.7601.25632
View patch
microsoftpatch availablevia msrc
Product: Windows 7 for 32-bit Systems Service Pack 1
View patch
microsoftpatch availablevia msrc
Product: Windows 7 for x64-based Systems Service Pack 1
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2008 for 32-bit Systems Service Pack 2
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2008 for x64-based Systems Service Pack 2
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2008 R2 for x64-based Systems Service Pack 1
View patch
microsoftpatch availablevia msrc
Product: Windows 8.1 for 32-bit systemsFixed in: 6.3.9600.20045
View patch
microsoftpatch availablevia msrc
Product: Windows 8.1 for x64-based systemsFixed in: 6.3.9600.20045
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2012 R2Fixed in: 6.3.9600.20045
View patch
microsoftpatch availablevia msrc
Product: Windows 8.1 for 32-bit systemsFixed in: 1.0.0.0
View patch
microsoftpatch availablevia msrc
Product: Windows 8.1 for x64-based systemsFixed in: 1.0.0.0
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2012Fixed in: 1.0.0.0
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2012 R2Fixed in: 1.0.0.0
View patch
microsoftpatch availablevia msrc
Product: Windows RT 8.1Fixed in: 6.3.9600.20045
microsoftpatch availablevia msrc
Product: Windows Server 2008 for 32-bit Systems Service Pack 2Fixed in: 6.0.6003.21137
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2008 for x64-based Systems Service Pack 2Fixed in: 6.0.6003.21137
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2012Fixed in: 6.2.9200.23372
View patch

Vendor Advisories (1)

microsoft2021-Jun/CVE-2021-33742Critical

Windows MSHTML Platform Remote Code Execution Vulnerability

Jun 8, 2021

References

cisa.gov / known-exploited-vulnerabilities-catalog
US Government Resource
portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2021-33742
PatchVendor Advisory