Is CVE-2021-31971 in the CISA KEV catalog?

No. CVE-2021-31971 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-31971?

CVE-2021-31971 has a CVSS v3 base score of 6.8 (MEDIUM).

What is the EPSS score for CVE-2021-31971?

CVE-2021-31971 has an EPSS score of 2.09% (79th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-31971?

Install KB5003687 for Windows 10. Fixes are available for 16 affected products.

CVE & CISA-KEV Catalog

CVE-2021-31971

MEDIUMEPSS 79th pctl

6.8

CVSS v3

NVD

Description

Windows HTML Platforms Security Feature Bypass Vulnerability

How to fix

Remediation Available

Windows 10Windows

Install:KB5003687Microsoft

Windows 10 Version 1607Windows

Install:KB5003638Microsoft

Windows 10 Version 1809Windows

Install:KB5003646Microsoft

Windows 10 Version 1909Windows

Install:KB5003635Microsoft

Windows 10 Version 2004Windows

Install:KB5003637Microsoft

Windows 10 Version 20H2Windows

Install:KB5003637Microsoft

Windows 10 Version 21H1Windows

Install:KB5003637Microsoft

Windows 7Windows

Install:KB5003636Microsoft

Install:KB5003667Microsoft

Windows 8.1Windows

Install:KB5003636Microsoft

Install:KB5003671Microsoft

Windows RT 8.1Windows

Install:KB5003671

Windows Server 2008Windows

Install:KB5003661Microsoft

Install:KB5003636Microsoft

Windows Server 2008 R2Windows

Install:KB5003667Microsoft

Install:KB5003636Microsoft

Windows Server 2012Windows

Install:KB5003636Microsoft

Install:KB5003697Microsoft

Windows Server 2012 R2Windows

Install:KB5003671Microsoft

Install:KB5003636Microsoft

Windows Server 2016Windows

Install:KB5003638Microsoft

Windows Server 2019Windows

Install:KB5003646Microsoft

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

2.09%probability of exploitation in 30 days

79thpercentile

Elevated risk: more likely to be exploited than 79% of all known CVEs.

References

Patch1

portal.msrc.microsoft.com

Embed a live status badge for CVE-2021-31971

Markdown

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HTML

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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.