Is CVE-2021-26900 in the CISA KEV catalog?

No. CVE-2021-26900 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-26900?

CVE-2021-26900 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2021-26900?

CVE-2021-26900 has an EPSS score of 2.35% (82th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-26900?

Install KB5000808 for Windows 10 Version 1909. Fixes are available for 6 affected products.

CVE & CISA-KEV Catalog

CVE-2021-26900

HIGHEPSS 82th pctl

7.8

CVSS v3

NVD

Description

Windows Win32k Elevation of Privilege Vulnerability

CWE-416Use After Free

How to fix

Remediation Available

Windows 10 Version 1909Windows

Install:KB5000808Microsoft

Windows 10 Version 2004Windows

Install:KB5000802Microsoft

Windows 10 Version 20H2Windows

Install:KB5000802Microsoft

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

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

2.35%probability of exploitation in 30 days

82ndpercentile

Elevated risk: more likely to be exploited than 82% of all known CVEs.

References

Patch1

portal.msrc.microsoft.com

Third-Party Advisory1

zerodayinitiative.com

Related Vulnerabilities

Other CWE-416 (Use After Free) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-0708	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-31166	Critical	9.8	100%	KEV	Fix
CVE-2015-5119	Critical	9.8	99%	KEV	-
CVE-2010-3962	High	8.1	97%	KEV	-
CVE-2015-0313	Critical	9.8	96%	KEV	Fix
CVE-2017-9798	High	7.5	95%	-	Fix

Embed a live status badge for CVE-2021-26900

Markdown

[![CVE-2021-26900](https://tridentstack.com/cve/badge/CVE-2021-26900.svg)](https://tridentstack.com/cve/CVE-2021-26900)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-26900"><img src="https://tridentstack.com/cve/badge/CVE-2021-26900.svg" alt="CVE-2021-26900"></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.