Review reviewHigh

CVE-2021-38659

Microsoft Microsoft 365 Apps for Enterprise, 365 apps

CVE-2021-38659 affects Microsoft Microsoft 365 Apps for Enterprise, 365 apps. Review the CVSS score, exploitation signals, affected versions, remediation status, and linked source material before making a change.

CVSS
7.8
EPSS
6.31%
93.0% percentile
CISA KEV
Not listed
Published
2021.09.15
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability6.31%
Technical severityCVSS 7.8

Vulnerability overview

CVE-2021-38659 affects Microsoft Microsoft 365 Apps for Enterprise, 365 apps. Review the CVSS score, exploitation signals, affected versions, remediation status, and linked source material before making a change.

Affected product and versions

Product
Microsoft Microsoft 365 Apps for Enterprise, 365 apps
Affected versions
>= 16.0.1 < https://aka.ms/OfficeSecurityReleases
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Microsoft Microsoft 365 Apps for Enterprise, 365 apps and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE
Not available