Is CVE-2021-26443 in the CISA KEV catalog?

No. CVE-2021-26443 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-26443?

CVE-2021-26443 has a CVSS v3 base score of 9.0 (CRITICAL).

What is the EPSS score for CVE-2021-26443?

CVE-2021-26443 has an EPSS score of 1.55% (72th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-26443?

Install KB5007206 for Windows 10 Version 1809. Fixes are available for 11 affected products.

CVE & CISA-KEV Catalog

CVE-2021-26443

CRITICALEPSS 72th pctl

9.0

CVSS v3

NVD

Description

Microsoft Virtual Machine Bus (VMBus) Remote Code Execution Vulnerability

How to fix

Remediation Available

Windows 10 Version 1809Windows

Install:KB5007206Microsoft

Windows 10 Version 1909Windows

Install:KB5007189Microsoft

Windows 10 Version 2004Windows

Install:KB5007186Microsoft

Windows 10 Version 21H1Windows

Install:KB5007186Microsoft

Windows 11 version 21H2Windows

Install:KB5007215Microsoft

Windows Server 2019Windows

Install:KB5007206Microsoft

Windows Server 2019 (Server Core installation)Windows

Install:KB5007206Microsoft

Windows Server 2022Windows

Install:KB5007205Microsoft

Windows Server 2022 (Server Core installation)Windows

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 VectorAdjacent

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.55%probability of exploitation in 30 days

72ndpercentile

Elevated risk: more likely to be exploited than 72% of all known CVEs.

References

Patch1

portal.msrc.microsoft.com

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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.