CVE-2021-42292
Microsoft Excel Security Feature Bypass
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 1 December 2021). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
Microsoft Excel Security Feature Bypass Vulnerability
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 43.00% probability · 99th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 17 November 2021 · due 1 December 2021
- Affected
- microsoft/365 apps · microsoft/excel · microsoft/office · microsoft/office 2016 · microsoft/office 2019 · microsoft/office 2021
- Source
- secure@microsoft.com
EPSS 43.0% since 30 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
CISA notes
Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2021-42292
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-42292Patch, Vendor Advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42292Patch, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-42292US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.