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Fencer Intel
high 7.8

CVE-2021-31179 in the critical feed json

Microsoft Office Remote Code Execution Vulnerability

published 5y ago modified 4mo ago also EUVD-2021-18092

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
13.5%
EPSS 13.5% chance of exploitation in 30 days, percentile 96%
public exploits
0
none known

Summary

Microsoft Office Remote Code Execution Vulnerability

Patch / fix

  • Microsoft Microsoft Office Online Server 16.0.10374.20000
  • Microsoft Microsoft Excel 2016 16.0.5161.1000
  • Microsoft Microsoft Office 2016 16.0.5161.1000
  • Microsoft Microsoft Excel 2013 Service Pack 1 15.0.5345.1000
  • Microsoft Microsoft Office 2013 Service Pack 1 15.0.5345.1000
  • Microsoft Microsoft Office Web Apps Server 2013 Service Pack 1 15.0.5345.1000

Is CVE-2021-31179 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

13.49% chance of exploitation in the next 30 days, higher than 96% 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 Office 2019
  • Microsoft Microsoft Office Online Server
  • Microsoft Microsoft 365 Apps for Enterprise
  • Microsoft Microsoft Excel 2016
  • Microsoft Microsoft Office 2016
  • Microsoft Microsoft Excel 2013 Service Pack 1
  • Microsoft Microsoft Office 2013 Service Pack 1
  • Microsoft Microsoft Office Web Apps Server 2013 Service Pack 1

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.