7.8

CVE-2021-34501: microsoft 365_apps

CVSS: 7.8v3.1HighModified
Published 14-07-2021Last modified 10-08-2026
Open JSON

Vulnerability summary

CVE-2021-34501 is a high (CVSS 7.8) vulnerability in microsoft 365_apps. EPSS estimates a 51.67% chance of exploitation in the next 30 days, higher than 98.9% of scored vulnerabilities.

Overall risk
42/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
51.67%
0%100%
Critical · +0.28 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 14-07-2021
    PublishedVulnerability first disclosed.
  2. 10-08-2026
    Last modifiedVulnerability information updated.

Description

Microsoft Excel Remote Code Execution Vulnerability

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

51.67%

Chance of exploitation in the next 30 days

Percentile

99%

Versus all other CVEs

30-day change

+0.28 pp

From 51.39% on 20-09-2026

20-09-202620-10-2026
EPSS score
51.67%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Microsoft10 products

1 vendor · 10 products

References

3 links