CVE-2021-34501 in the critical feed json
Microsoft Excel Remote Code Execution Vulnerability
published 2021-07-14 5 y ago modified 2026-08-10 2 mo ago also EUVD-2021-21155
- cvss
- 8.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 51.7%
- EPSS 51.7% chance of exploitation in 30 days, percentile 98%
- public exploits
- 0
- none known
Summary
Microsoft Excel Remote Code Execution Vulnerability
Patch / fix
- Microsoft Microsoft Excel 2013 Service Pack 1 15.0.5363.1000
- Microsoft Microsoft Excel 2016 16.0.5188.100
- Microsoft Microsoft Office 2019 for Mac 16.51.210711.01
- Microsoft Microsoft Office Online Server 16.0.10376.20001
Exploit prediction
51.67% chance of exploitation in the next 30 days, higher than 98% 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 |
| CNA | 3.1 | 8.8 | CVSS:3.1/AV:N/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 2013 Service Pack 1
- Microsoft Microsoft Excel 2016
- Microsoft Microsoft Office 2019
- Microsoft Microsoft Office 2019 for Mac
- Microsoft Microsoft Office Online Server
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2021-34501
vendor-advisory, patch
-
portal.msrc.microsoft.com
/en-US/security-guidance/advisory/CVE-2021-34501
patch, vendor-advisory
-
zerodayinitiative.com
/advisories/ZDI-21-969/
third-party-advisory, vdb-entry
Sources
- CVE List CVE-2021-34501
- NVD CVE-2021-34501
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.