CVE-2021-31178 json
Microsoft Office Information Disclosure Vulnerability
published 5y ago modified 4mo ago also EUVD-2021-18091
- cvss
- 5.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 16.0%
- EPSS 16.0% chance of exploitation in 30 days, percentile 96%
- public exploits
- 0
- none known
Summary
Microsoft Office Information Disclosure Vulnerability
Patch / fix
- Microsoft Microsoft Office Online Server 16.0.10374.20000
- Microsoft Microsoft Excel 2016 16.0.5161.1000
- Microsoft Microsoft Office 2016 16.0.5161.1000
- Microsoft Microsoft Excel 2013 Service Pack 1 15.0.5345.1000
- Microsoft Microsoft Office 2013 Service Pack 1 15.0.5345.1000
- Microsoft Microsoft Office Web Apps Server 2013 Service Pack 1 15.0.5345.1000
Is CVE-2021-31178 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerExploit prediction
16.01% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.5 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C |
| CNA | 3.1 | 5.5 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:P/I:N/A:N |
Affected products
- Microsoft Microsoft Office 2019
- Microsoft Microsoft Office Online Server
- Microsoft Microsoft 365 Apps for Enterprise
- Microsoft Microsoft Excel 2016
- Microsoft Microsoft Office 2016
- Microsoft Microsoft Excel 2013 Service Pack 1
- Microsoft Microsoft Office 2013 Service Pack 1
- Microsoft Microsoft Office Web Apps Server 2013 Service Pack 1
Classification
- Weakness
-
- CWE-191 Integer Underflow (Wrap or Wraparound)
References
-
portal.msrc.microsoft.com
/en-US/security-guidance/advisory/CVE-2021-31178
patch, vendor-advisory
Sources
- CVE List CVE-2021-31178
- NVD CVE-2021-31178
Fencer Intel 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.