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Fencer Intel
high 7.8

CVE-2021-38655 json

Microsoft Excel Remote Code Execution Vulnerability

published 5y ago modified 2mo ago also EUVD-2021-25094

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
6.4%
EPSS 6.4% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

Microsoft Excel Remote Code Execution Vulnerability

Patch / fix

  • Microsoft Microsoft Excel 2013 Service Pack 1 5381.1000
  • Microsoft Microsoft Excel 2016 5215.1000
  • Microsoft Microsoft Office 2019 for Mac 16.53.21091200
  • Microsoft Microsoft Office Online Server 10378.20000
  • Microsoft Microsoft Office Web Apps Server 2013 Service Pack 1 5381.1000

Is CVE-2021-38655 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Exploit prediction

6.39% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • Microsoft Microsoft 365 Apps for Enterprise
  • Microsoft Microsoft Excel 2013 Service Pack 1
  • Microsoft Microsoft Excel 2016
  • Microsoft Microsoft Office 2019
  • Microsoft Microsoft Office 2019 for Mac
  • Microsoft Microsoft Office Online Server
  • Microsoft Microsoft Office Web Apps Server 2013 Service Pack 1

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.