CVE-2021-33742
KEVMicrosoft Windows MSHTML Platform Remote Code Execution Vulnerability
Description
Microsoft Windows MSHTML Platform contains an unspecified vulnerability that allows for remote code execution.
Windows MSHTML Platform Remote Code Execution Vulnerability
CVSS 3.1 vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:HPublishedJun 8, 2021
Last modifiedJun 17, 2026
Added to KEVNov 3, 2021
Remediation dueNov 17, 2021
References
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33742PatchVendor Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33742US Government Resource
0 recent articles mention this CVE
73
Risk assessment · High
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 1804 days
- CVSS
- 7.5 HIGH
- EPSS (30-day exploit probability)
- 59.4% · top 1% of all CVEs
- Weakness
- CWE-787
- Attack vector
- Network, remotely reachable
Recommended actions
- 1.Apply updates per vendor instructions.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
- 4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.