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Fencer Vulns
high 7.8

CVE-2021-27057 json

Microsoft Office Remote Code Execution Vulnerability

published 2021-03-11 5 y ago modified 2026-08-19 2 mo ago also EUVD-2021-13828

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
4.3%
EPSS 4.3% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

Microsoft Office Remote Code Execution Vulnerability

Patch / fix

  • Microsoft Microsoft Excel 2010 Service Pack 2 14.0.7266.5000
  • Microsoft Microsoft Excel 2016 16.0.5134.1000
  • Microsoft Microsoft Office 2010 Service Pack 2 14.0.7266.5000
  • Microsoft Microsoft Office 2016 16.0.5134.1000
  • Microsoft Microsoft Office Online Server 16.0.10372.20000
  • Microsoft Microsoft Office Web Apps 2013 Service Pack 1 15.0.5327.1000

Exploit prediction

4.32% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

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 2010 Service Pack 2
  • Microsoft Microsoft Excel 2013 Service Pack 1
  • Microsoft Microsoft Excel 2016
  • Microsoft Microsoft Office 2010 Service Pack 2
  • Microsoft Microsoft Office 2013 Service Pack 1
  • Microsoft Microsoft Office 2016
  • Microsoft Microsoft Office 2019
  • Microsoft Microsoft Office 2019 for Mac
  • Microsoft Microsoft Office Online Server
  • Microsoft Microsoft Office Web Apps 2013 Service Pack 1

References

Sources

Fencer Vulns 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.