CVE-2021-31178: microsoft 365_apps Integer Underflow (Wrap or Wraparound)
CVSS: 5.5v3.1MediumModified
Published 11-05-2021Last modified 03-08-2024
Vulnerability summary
CVE-2021-31178 is a medium (CVSS 5.5) Integer Underflow (Wrap or Wraparound) vulnerability in microsoft 365_apps. EPSS estimates a 16.01% chance of exploitation in the next 30 days, higher than 96.8% of scored vulnerabilities.
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)EPSS score
16.01%
0%100%
Medium · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 11-05-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
Microsoft Office Information Disclosure Vulnerability
CVSS metrics
3 scores · 2 sources · 2 versionsMedium 5.5Preferred score · CVE.org (CNA)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:CSourcesAll 2 agree
- NVDNIST5.5MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Medium 4.3Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:P/I:N/A:NSourcesSingle source
EPSS trend
Probability
16.01%
Chance of exploitation in the next 30 days
Percentile
97%
Versus all other CVEs
30-day change
0.00 pp
From 16.01% on 18-09-2026
18-09-202618-10-2026
EPSS score16.01%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Microsoft14 products
- 365_appsna
- excel2013:sp1 | 2016
- microsoft 365 apps for enterprise≥ 16.0.1, < https://aka.ms/OfficeSecurityReleases
- microsoft excel 2013 service pack 1≥ 15.0.0.0, < 15.0.5345.1000
- microsoft excel 2016≥ 16.0.0.0, < 16.0.5161.1000
1 vendor · 14 products
References
1 links
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31178X Refsource MISCPatchVendor Advisory