Is CVE-2021-42279 in the CISA KEV catalog?

No. CVE-2021-42279 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-42279?

CVE-2021-42279 has a CVSS v3 base score of 4.2 (MEDIUM).

What is the EPSS score for CVE-2021-42279?

CVE-2021-42279 has an EPSS score of 1.95% (78th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-42279?

Install KB5007207 for Windows 10. Fixes are available for 13 affected products.

CVE & CISA-KEV Catalog

CVE-2021-42279

MEDIUMEPSS 78th pctl

4.2

CVSS v3

NVD

Description

Chakra Scripting Engine Memory Corruption Vulnerability

CWE-787Out-of-bounds Write

How to fix

Remediation Available

Windows 10Windows

Install:KB5007207Microsoft

Windows 10 Version 1607Windows

Install:KB5007192Microsoft

Windows 10 Version 1809Windows

Install:KB5007206Microsoft

Windows 10 Version 1909Windows

Install:KB5007189Microsoft

Windows 10 Version 2004Windows

Install:KB5007186Microsoft

Windows 10 Version 20H2Windows

Install:KB5007186Microsoft

Windows 10 Version 21H1Windows

Install:KB5007186Microsoft

Windows 11 version 21H2Windows

Install:KB5007215Microsoft

Windows Server 2016Windows

Install:KB5007192Microsoft

Windows Server 2019Windows

Install:KB5007206Microsoft

Windows Server 2022Windows

Install:KB5007205Microsoft

Windows Server, version 2004 (Server Core installation)Windows

Install:KB5007186Microsoft

Windows Server, version 20H2 (Server Core Installation)Windows

Install:KB5007186Microsoft

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

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

1.95%probability of exploitation in 30 days

78thpercentile

Elevated risk: more likely to be exploited than 78% of all known CVEs.

References

Patch1

portal.msrc.microsoft.com

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	Fix

Embed a live status badge for CVE-2021-42279

Markdown

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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.