High 7.8Known exploited (CISA KEV)Published Nov 9, 2021

CVE-2021-42292Microsoft Excel Security Feature Bypass Vulnerability

Updated under an hour ago (Oct 27, 2026, 10:00 AM ET)

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It affects Microsoft 365 Apps for Enterprise and 12 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Nov 17, 2021; federal agencies had to remediate by Dec 1, 2021. Treat that date as your deadline.

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Exploited in the last 30 days

Microsoft Excel Security Feature Bypass Vulnerability

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
Weakness (CWE): Not given
Known exploited: Added to CISA KEV Nov 17, 2021; federal remediation due Dec 1, 2021Apply updates per vendor instructions.
EPSS (exploitation in the next 30 days): 43.00% (percentile 99)
Assigned by: microsoft
NVD analysis: Analyzed
Record last updated: Aug 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Microsoft Microsoft 365 Apps for Enterprise microsoft:365_apps_for_enterprise (from the name)	from 16.0.1 before https://aka.ms/OfficeSecurityReleases	CNA record
Microsoft Microsoft Excel 2013 Service Pack 1 microsoft:excel_2013_service_pack_1 (from the name)	from 15.0.0.0 before 15.0.5397.1001	CNA record
Microsoft Microsoft Excel 2016 microsoft:excel_2016 (from the name)	from 16.0.0.0 before 16.0.5239.1001	CNA record
Microsoft Microsoft Office 2013 Service Pack 1 microsoft:office_2013_service_pack_1 (from the name)	from 15.0.0 before 15.0.5397.1001	CNA record
Microsoft Microsoft Office 2016 microsoft:office_2016 (from the name)	from 16.0.0 before 16.0.5239.1001	CNA record
Microsoft Microsoft Office 2019 microsoft:office_2019 (from the name)	from 19.0.0 before https://aka.ms/OfficeSecurityReleases	CNA record
Microsoft Microsoft Office 2019 for Mac microsoft:office_2019_for_mac (from the name)	from 16.0.0 before 16.55.21111400	CNA record
Microsoft Microsoft Office LTSC 2021 microsoft:office_ltsc_2021 (from the name)	from 16.0.1 before https://aka.ms/OfficeSecurityReleases	CNA record
Microsoft Microsoft Office LTSC for Mac 2021 microsoft:office_ltsc_for_mac_2021 (from the name)	from 16.0.1 before 16.55.21111400	CNA record
microsoft 365_apps microsoft:365_apps	all versions	NVD
1–10 of 15

References

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-42292	vendor-advisory, patch
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42292	patch, vendor-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-42292	us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.