CVE-2021-33742

HIGHNVD 7.59.0▲Trending — 5 sources updated this weekExploited in the wild

7.5

Windows MSHTML Platform Remote Code Execution Vulnerability

CVSS v3: 7.5
EG Score: 9.0(high)
EPSS: 98.8%
KEV: ⚠ Exploited

Published

June 8, 2021

Last Modified

October 29, 2025

References (3)

secure@microsofthttps://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33742
af854a3a-2127-422b-91ae-364da2661108https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33742
134c704f-9b21-4f2e-91b3-4a467353bcc0https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33742

Weakness Classification(3)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Frequently asked(6)

What is CVE-2021-33742?

CVE-2021-33742 is a high vulnerability published on June 8, 2021. Windows MSHTML Platform Remote Code Execution Vulnerability

When was CVE-2021-33742 disclosed?

CVE-2021-33742 was first published in the National Vulnerability Database on June 8, 2021, with the most recent update on October 29, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-33742 actively exploited?

Yes. CISA added CVE-2021-33742 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Microsoft Windows. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.

What is the CVSS score of CVE-2021-33742?

CVE-2021-33742 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.

Which products are affected by CVE-2021-33742?

CVE-2021-33742 affects Microsoft Windows. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.

How do I remediate CVE-2021-33742?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-33742, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2021-33742

📅 Published

🔄 Last Modified

🔗 References (3)