HIGHCVSS v3.1 7.5Actively exploited · CISA KEV since 2021-11-03Vulnerability

CVE-2021-33742

Microsoft Windows MSHTML Platform contains an unspecified vulnerability that allows for remote code execution.

Properties

Euvd product
Windows 10 Version 1809, Windows Server 2012 R2, Windows 10 Version 1507, Windows Server 2008 Service Pack 2, Windows Server 2019, Windows 7, Windows Server 2008 R2 Service Pack 1, Windows 10 Version 1607, Windows Server 2012, Windows 8.1, Windows Server 2016, Windows 10 Version 2004, Windows 7 Service Pack 1, Windows 10 Version 20H2, Windows 10 Version 1909, Windows 10 Version 21H1
Vulnerability name
Microsoft Windows MSHTML Platform Remote Code Execution Vulnerability
First seen
2025-10-21T23:25:42+00:00
Cvss score
7.5
Epss score
0.59407
Last seen
2026-10-19T12:00:27+00:00
Due date
2021-11-17
Euvd assigner
microsoft
Retrieved at
2026-10-21T01:24:47+00:00
Exploited euvd since
2021-11-03T00:00:00+00:00
Src batch id
epss_history-20261020T103617Z-728ddd
Source url
https://epss.empiricalsecurity.com/epss_scores-2026-10-19.csv.gz
Date added
2021-11-03
Score
7.5
Euvd base score version
3.1
Fetched at
2026-10-20T10:36:20+00:00
Euvd vendor
Microsoft
Cvss vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
In Signal since
initial import (Sep 2026)
Euvd base score
7.5

Related Entities (20)

AFFECTS_PRODUCT (16)

→[Product]cpe:2.3:o:microsoft:windows_10_1909:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_21h1:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*
→[Product]cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2008:sp2:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_2004:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_20h2:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*

DESCRIBES (1)

←[KEVEntry]Microsoft Windows MSHTML Platform Remote Code Execution Vulnerability

HAS_WEAKNESS (1)

→[Weakness]Out-of-bounds Write

INVOLVES (1)

←[Signal]kev_added · 2021-11-03

MENTIONED_IN (1)

→[Campaign]Exposing AdFection: How Discover-Tech Turned Targeted Ads Into a Pipeline for Zero-Click Mercenary Spyware

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CVE-2021-33742 (CVSS v3.1 7.5) — Ninja Signal Threat Intelligence | Ninja Signal