VulnerabilityModified

CVE-2021-34534

Windows MSHTML Platform Remote Code Execution Vulnerability

MEDIUM 6.8EPSS 2.24%

Does this matter?

Lower severity and a low EPSS score (2.24%). Track it; it rarely justifies an emergency change on its own.

Description

Windows MSHTML Platform Remote Code Execution Vulnerability

CVSS 3.1: 6.8 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
EPSS: 2.24% probability · 83th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Affected: microsoft/windows 10 · microsoft/windows server 2016 · microsoft/windows server 2019
Source: secure@microsoft.com

EPSS trend

EPSS 2.2% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34534
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34534Patch, Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.