Is CVE-2021-26870 in the CISA KEV catalog?

No. CVE-2021-26870 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-26870?

CVE-2021-26870 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2021-26870?

CVE-2021-26870 has an EPSS score of 0.60% (45th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-26870?

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

CVE & CISA-KEV Catalog

CVE-2021-26870

HIGH

7.8

CVSS v3

NVD

Description

Windows Projected File System Elevation of Privilege Vulnerability

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

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

0.60%probability of exploitation in 30 days

45thpercentile

Moderate risk: more likely to be exploited than 45% 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.