VulnerabilityModified
CVE-2021-34501
Microsoft Excel Remote Code Execution Vulnerability
HIGH 7.8EPSS 51.7%
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 51.7%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
Description
Microsoft Excel Remote Code Execution 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
- 51.67% probability · 99th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- microsoft/365 apps · microsoft/excel · microsoft/office · microsoft/office online server
- Source
- secure@microsoft.com
EPSS 51.7% since 27 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.
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34501
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34501Patch, Vendor Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-21-969/Third Party Advisory, VDB Entry
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.