Is CVE-2021-43247 in the CISA KEV catalog?

No. CVE-2021-43247 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-43247?

CVE-2021-43247 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2021-43247?

CVE-2021-43247 has an EPSS score of 0.90% (55th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-43247?

Install KB5008218 for Windows 10 Version 1809. Fixes are available for 13 affected products.

CVE & CISA-KEV Catalog

CVE-2021-43247

HIGH

7.8

CVSS v3

NVD

Description

Windows TCP/IP Driver Elevation of Privilege Vulnerability

CWE-787Out-of-bounds Write

How to fix

Remediation Available

Windows 10 Version 1809Windows

Install:KB5008218Microsoft

Windows 10 Version 1909Windows

Install:KB5008206Microsoft

Windows 10 Version 2004Windows

Install:KB5008212Microsoft

Windows 10 Version 20H2Windows

Install:KB5008212Microsoft

Windows 10 Version 21H1Windows

Install:KB5008212Microsoft

Windows 10 Version 21H2Windows

Install:KB5008212Microsoft

Windows 11 version 21H2Windows

Install:KB5008215Microsoft

Windows Server 2019Windows

Install:KB5008218Microsoft

Windows Server 2019 (Server Core installation)Windows

Install:KB5008218Microsoft

Windows Server 2022Windows

Install:KB5008223Microsoft

Windows Server 2022 (Server Core installation)Windows

Install:KB5008223Microsoft

Windows Server, version 2004 (Server Core installation)Windows

Install:KB5008212Microsoft

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

Install:KB5008212Microsoft

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 VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.90%probability of exploitation in 30 days

55thpercentile

Moderate risk: more likely to be exploited than 55% of all known CVEs.

References

Patch1

portal.msrc.microsoft.com

Third-Party Advisory1

zerodayinitiative.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-2021-43247

Markdown

[![CVE-2021-43247](https://tridentstack.com/cve/badge/CVE-2021-43247.svg)](https://tridentstack.com/cve/CVE-2021-43247)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-43247"><img src="https://tridentstack.com/cve/badge/CVE-2021-43247.svg" alt="CVE-2021-43247"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

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.