Is CVE-2021-31966 in the CISA KEV catalog?

No. CVE-2021-31966 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-31966?

CVE-2021-31966 has a CVSS v3 base score of 7.2 (HIGH).

What is the EPSS score for CVE-2021-31966?

CVE-2021-31966 has an EPSS score of 4.58% (90th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-31966?

Install KB5001954 for Microsoft SharePoint Enterprise Server 2013 Service Pack 1. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2021-31966

HIGHEPSS 90th pctl

7.2

CVSS v3

NVD

Description

Microsoft SharePoint Server Remote Code Execution Vulnerability

How to fix

Remediation Available

Microsoft SharePoint Enterprise Server 2013 Service Pack 1Microsoft

Install:KB5001954Microsoft

Microsoft SharePoint Enterprise Server 2016Microsoft

Install:KB5001922Microsoft

Install:KB5001946Microsoft

Microsoft SharePoint Foundation 2013 Service Pack 1Microsoft

Install:KB5001962Microsoft

Install:KB5001939Microsoft

Microsoft SharePoint Server 2019Microsoft

Install:KB5001945Microsoft

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 ComplexityLow

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

4.58%probability of exploitation in 30 days

90thpercentile

High risk: more likely to be exploited than 90% 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.