CVE-2021-38656
mediumpriority · track · 29EPSS 0.067 · 94 %ileEURUUSEPSS · scored 2026-10-27
Microsoft Word Remote Code Execution Vulnerability
remediations
Vendor fix, mitigation, or workaround guidance, as published by each source.
A vendor fix is available.
- FixedMicrosoft 365 Apps for Enterprise for 32-bit Systemsmsrc_csaf
https://aka.ms/OfficeSecurityReleases:Security Update:https://docs.microsoft.com/en-us/officeupdates/office365-proplus-security-updates
https://docs.microsoft.com/en-us/officeupdates/office365-proplus-security-updates - FixedMicrosoft 365 Apps for Enterprise for 64-bit Systemsmsrc_csaf
https://aka.ms/OfficeSecurityReleases:Security Update:https://docs.microsoft.com/en-us/officeupdates/office365-proplus-security-updates
https://docs.microsoft.com/en-us/officeupdates/office365-proplus-security-updates
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5.8–7.8
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (7)
Products and version ranges known to be affected.
- Microsoft Microsoft 365 Apps for Enterprise16.0.1 → https://aka.ms/OfficeSecurityReleasesenisa_euvdEU
- Microsoft 365 Apps for Enterprise for 32-bit Systems< https://aka.ms/OfficeSecurityReleasesmsrc_csafUS
- Microsoft 365 Apps for Enterprise for 64-bit Systems< https://aka.ms/OfficeSecurityReleasesmsrc_csafUS
advisories (1)
Vendor and ecosystem advisories describing this.
- msrc_CVE-2021-38656Microsoft Word Remote Code Execution Vulnerability2021-09-14csaf · msrc_csafUS
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
also known as (6)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (10)
External citations — patches, advisories, analysis.
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-38656cnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2021-38656cnnvd
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-38656cnnvd
- https://vigilance.fr/vulnerability/Microsoft-365-Apps-vulnerabilities-of-September-2021-36409cnnvd
- https://www.cybersecurity-help.cz/vdb/SB2021091442cnnvd
- https://www.zerodayinitiative.com/advisories/ZDI-21-1082/cnnvd
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-38656enisa_euvd
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-38656nvd
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