MSRC-CVE-2021-34478 — Microsoft Office Remote Code Execution Vulnerability

Summary

Impact: Remote Code Execution. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?
A user needs to be tricked into running malicious files.

Is the Preview Pane an attack vector for this vulnerability?
No, the Preview Pane is not an attack vector.

Security updates
https — https://docs.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates

Vulnerabilities 1

High 7.8

CVE-2021-34478 EPSS 52%

Microsoft Office Remote Code Execution Vulnerability

Microsoft Office Remote Code Execution Vulnerability

Microsoft Microsoft 365 Apps for Enterprise Microsoft Office 2019

Aug 12, 2021

Revision history

2021-08-25 #3
Added acknowledgements. This is an informational change only.
2021-08-19 #2
To comprehensively address CVE-2021-24478, Microsoft has released an updated Build for Microsoft 365 Apps installed on Windows 7 and for the Semi-Annual Enterprise Channel: Version 2002. The new Build number is 12527.22021. See [Release notes for Microsoft Office security updates](https://docs.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates) for more information.
2021-08-10 #1
Information published.

References

CVE-2021-34478 Microsoft Office Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34478
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss