CVE-2022-21840Network attack vector

Remote code execution after user interaction

Published Jan 11, 2022 · Updated Jan 2, 2025

Remote code execution in affected Microsoft Office and SharePoint releases allows remote attackers to run code after user interaction. Microsoft has not published the affected component, crafted input format, or incorrect operation that processes that input. A victim must voluntarily interact with the attack mechanism; successful exploitation executes code through the affected application or server component.

CVSS severity8.8
High
EPSS probability3.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Remote code execution in affected Microsoft Office and SharePoint releases allows remote attackers to run code after user interaction. Microsoft has not published the affected component, crafted input format, or incorrect operation that processes that input. A victim must voluntarily interact with the attack mechanism; successful exploitation executes code through the affected application or server component.

The record

CVE
CVE-2022-21840
Published
Jan 11, 2022
Updated
Jan 2, 2025
Vendor
Microsoft
Product
Microsoft SharePoint Foundation 2013
Classifications
T1204, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 11, 2022CVE publishedPublication date reported by the CVE source.
  2. Jan 2, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=15.0.0 <15.0.5415.1000

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft SharePoint Foundation 2013version=15.0.0 <15.0.5415.1000
Microsoft · Microsoft Office 2016version=16.0.0 <16.0.5266.1000
Microsoft · Microsoft Office 2019version=19.0.0 <https://aka.ms/OfficeSecurityReleases
Microsoft · Microsoft Excel 2016version=16.0.0.0 <16.0.5266.1000
Microsoft · Microsoft SharePoint Enterprise Server 2016version=16.0.0 <16.0.5266.1000
Microsoft · Microsoft Office LTSC for Mac 2021version=16.0.1 <16.57.22011101
Microsoft · Microsoft SharePoint Enterprise Server 2013version=15.0.0 <15.0.5415.1000
Microsoft · Microsoft SharePoint Server 2019version=16.0.0 <16.0.10382.20004
Microsoft · Microsoft Office 2013version=15.0.0 <15.0.5415.1000
Microsoft · Microsoft SharePoint Server Subscription Edition Language Packversion=16.0.0 <16.0.14326.20714
Microsoft · Microsoft Excel 2013version=15.0.0.0 <15.0.5415.1000
Microsoft · Microsoft Office 2019 for Macversion=16.0.0 <16.57.22011101
Microsoft · Microsoft Office LTSC 2021version=16.0.1 <https://aka.ms/OfficeSecurityReleases
Microsoft · Microsoft Office Online Serverversion=16.0.1 <16.0.10382.20004
Microsoft · Microsoft Office Web Apps Server 2013version=15.0.1 <15.0.5415.1000
Microsoft · Microsoft SharePoint Server Subscription Editionversion=16.0.0 <16.0.14326.20714
Microsoft · Microsoft 365 Apps for enterpriseversion=16.0.1 <https://aka.ms/OfficeSecurityReleases

Published CVSS scores

8.8Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1204User Execution
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo