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CVE-2021-33742Windows MSHTML Platform Remote Code Execution Vulnerability

Windows MSHTML Platform Remote Code Execution Vulnerability

8.8 HIGHEPSS 59.40%⚡ Known Exploited (CISA KEV)NVD: Analyzed

Last updated: 2026-06-17 03:55 UTC

OverviewCVSS details

8.8HIGHCVSS 3.1

Score source: NVD
NVD status: Analyzed
Published: Jun 8, 2021
Assigner: microsoft

Affected

Windows 10 Version 1809 (Microsoft)

Versions: 10.0.0 before 10.0.17763.1999
Fixed in: 10.0.17763.1999

+16 more products →

Exploitation

Public exploit: None listed
CISA KEV: Listed · Nov 3, 2021
KEV due date: Nov 17, 2021
Ransomware use: Unknown
SSVC: Exploitation active · Automatable no · Impact total

EPSS · FIRST, scored Nov 7

59.40%chance of exploitation in 30 days

Higher than 99.12% of CVEs

CVSS 3.1 · NVD

8.8High

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

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: Required
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

CVSS 3.1 · microsoft (CNA)

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

CVSS 3.1 · microsoft (CNA)

7.5High

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

Attack vector: Network
Attack complexity: High
Privileges required: None
User interaction: Required
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

CVSS 2.0 · NVD

6.8Medium

AV:N/AC:M/Au:N/C:P/I:P/A:P

Attack vector: Network
Attack complexity: Medium
Authentication: None
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

NVD status: Analyzed

Overview Affected Products References

Overview

Severity

Score	Severity	Version	Vector String
8.8	HIGH	3.1NVD	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.5	HIGH	3.1microsoft (CNA)	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
7.5	HIGH	3.1microsoft (CNA)	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
6.8	MEDIUM	2.0NVD	AV:N/AC:M/Au:N/C:P/I:P/A:P

CISA required action

⚡ Known exploited · remediation due Nov 17, 2021

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Details

CVE ID: CVE-2021-33742
Status: Analyzed
Assigner (CNA): microsoft
Published: Jun 8, 2021
Last modified: 2026-06-17 03:55 UTC
Weaknesses: CWE-787
CWE-823

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 10:39 UTC.