Is CVE-2021-26863 in the CISA KEV catalog?

No. CVE-2021-26863 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-26863?

CVE-2021-26863 has a CVSS v3 base score of 7.0 (HIGH).

What is the EPSS score for CVE-2021-26863?

CVE-2021-26863 has an EPSS score of 12.23% (96th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-26863?

Install KB5000809 for Windows 10 Version 1803. Fixes are available for 10 affected products.

CVE & CISA-KEV Catalog

CVE-2021-26863

HIGHEPSS 96th pctl

7.0

CVSS v3

NVD

Description

Windows Win32k Elevation of Privilege Vulnerability

CWE-269Improper Privilege Management

How to fix

Remediation Available

Windows 10 Version 1803Windows

Install:KB5000809Microsoft

Windows 10 Version 1809Windows

Install:KB5000822Microsoft

Windows 10 Version 1909Windows

Install:KB5000808Microsoft

Windows 10 Version 2004Windows

Install:KB5000802Microsoft

Windows 10 Version 20H2Windows

Install:KB5000802Microsoft

Windows Server 2019Windows

Install:KB5000822Microsoft

Windows Server 2019 (Server Core installation)Windows

Install:KB5000822Microsoft

Windows Server, version 1909 (Server Core installation)Windows

Install:KB5000808Microsoft

Windows Server, version 2004 (Server Core installation)Windows

Install:KB5000802Microsoft

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

Install:KB5000802Microsoft

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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 ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

12.23%probability of exploitation in 30 days

96thpercentile

Very high risk: more likely to be exploited than 96% of all known CVEs.

References

Patch1

portal.msrc.microsoft.com

Exploit1

packetstormsecurity.com

Related Vulnerabilities

Other CWE-269 (Improper Privilege Management) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-12635	Critical	9.8	100%	-	Fix
CVE-2022-24637	Critical	9.8	99%	-	Fix
CVE-2017-5689	Critical	9.8	92%	KEV	Fix
CVE-2020-3243	Critical	9.8	88%	-	-
CVE-2024-21888	High	8.8	87%	-	-
CVE-2022-0441	Critical	9.8	85%	-	Fix

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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.