Is CVE-2021-34534 in the CISA KEV catalog?

No. CVE-2021-34534 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-34534?

CVE-2021-34534 has a CVSS v3 base score of 6.8 (MEDIUM).

What is the EPSS score for CVE-2021-34534?

CVE-2021-34534 has an EPSS score of 1.92% (77th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-34534?

Install KB5005040 for Windows 10. Fixes are available for 9 affected products.

CVE & CISA-KEV Catalog

CVE-2021-34534

MEDIUMEPSS 77th pctl

6.8

CVSS v3

NVD

Description

Windows MSHTML Platform Remote Code Execution Vulnerability

How to fix

Remediation Available

Windows 10Windows

Install:KB5005040Microsoft

Windows 10 Version 1607Windows

Install:KB5005043Microsoft

Windows 10 Version 1809Windows

Install:KB5005030Microsoft

Windows 10 Version 1909Windows

Install:KB5005031Microsoft

Windows 10 Version 2004Windows

Install:KB5005033Microsoft

Windows 10 Version 20H2Windows

Install:KB5005033Microsoft

Windows 10 Version 21H1Windows

Install:KB5005033Microsoft

Windows Server 2016Windows

Install:KB5005043Microsoft

Windows Server 2019Windows

Install:KB5005030Microsoft

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

1.92%probability of exploitation in 30 days

77thpercentile

Elevated risk: more likely to be exploited than 77% of all known CVEs.

References

Patch1

portal.msrc.microsoft.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.