Is CVE-2022-21840 in the CISA KEV catalog?

No. CVE-2022-21840 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2022-21840?

CVE-2022-21840 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2022-21840?

CVE-2022-21840 has an EPSS score of 3.12% (86th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2022-21840?

Install KB5002128 for Microsoft Excel 2013 RT Service Pack 1. Fixes are available for 14 affected products.

CVE & CISA-KEV Catalog

CVE-2022-21840

HIGHEPSS 86th pctl

8.8

CVSS v3

NVD

Description

Microsoft Office Remote Code Execution Vulnerability

How to fix

Remediation Available

Microsoft Excel 2013 RT Service Pack 1Microsoft

Install:KB5002128

Microsoft Excel 2013 Service Pack 1Microsoft

Install:KB5002128Microsoft

Microsoft Excel 2016Microsoft

Install:KB5002114Microsoft

Microsoft Office 2013 RT Service Pack 1Microsoft

Install:KB5002124

Install:KB5002064

Install:KB4462205

Microsoft Office 2013 Service Pack 1Microsoft

Install:KB5002064Microsoft

Install:KB5002124Microsoft

Install:KB4462205Microsoft

Microsoft Office 2016Microsoft

Install:KB5002115Microsoft

Install:KB5002052Microsoft

Install:KB5002060Microsoft

Microsoft Office Online ServerMicrosoft

Install:KB5002107Microsoft

Microsoft Office Web Apps Server 2013 Service Pack 1Microsoft

Install:KB5002122Microsoft

Microsoft SharePoint Enterprise Server 2013 Service Pack 1Microsoft

Install:KB5002102Microsoft

Install:KB5001995Microsoft

Microsoft SharePoint Enterprise Server 2016Microsoft

Install:KB5002118Microsoft

Install:KB5002113Microsoft

Microsoft SharePoint Foundation 2013 Service Pack 1Microsoft

Install:KB5002129Microsoft

Install:KB5002127Microsoft

Microsoft SharePoint Server 2019Microsoft

Install:KB5002108Microsoft

Install:KB5002109Microsoft

Microsoft SharePoint Server Subscription EditionMicrosoft

Install:KB5002111Microsoft

SharePoint Server Subscription Edition Language PackMicrosoft

Install:KB5002110Microsoft

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 RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

3.12%probability of exploitation in 30 days

86thpercentile

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

References

Other references2

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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 2026-05-19.