Is CVE-2021-26420 in the CISA KEV catalog?

No. CVE-2021-26420 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-26420?

CVE-2021-26420 has a CVSS v3 base score of 7.1 (HIGH).

What is the EPSS score for CVE-2021-26420?

CVE-2021-26420 has an EPSS score of 2.96% (86th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-26420?

Install KB5001946 for Microsoft SharePoint Enterprise Server 2016. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2021-26420

HIGHEPSS 86th pctl

7.1

CVSS v3

NVD

Description

Microsoft SharePoint Server Remote Code Execution Vulnerability

How to fix

Remediation Available

Microsoft SharePoint Enterprise Server 2016Microsoft

Install:KB5001946Microsoft

Microsoft SharePoint Foundation 2013 Service Pack 1Microsoft

Install:KB5001962Microsoft

Microsoft SharePoint Server 2019Microsoft

Install:KB5001944Microsoft

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 VectorNetwork

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityLow

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

Exploit Intelligence

2.96%probability of exploitation in 30 days

86thpercentile

Elevated risk: more likely to be exploited than 86% of all known CVEs.

References

Patch1

portal.msrc.microsoft.com

Third-Party Advisory1

zerodayinitiative.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.