7.8

CVE-2025-21346: microsoft 365_apps Protection Mechanism Failure

CVSS: 7.8v3.1HighAnalyzed
Published 14-01-2025Last modified 09-06-2026
Open JSON

Vulnerability summary

CVE-2025-21346 is a high (CVSS 7.8) Protection Mechanism Failure vulnerability in microsoft 365_apps. EPSS estimates a 0.67% chance of exploitation in the next 30 days, higher than 51% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
0.67%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 14-01-2025
    PublishedVulnerability first disclosed.
  2. 09-06-2026
    Last modifiedVulnerability information updated.

Description

Microsoft Office Security Feature Bypass Vulnerability

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.67%

Chance of exploitation in the next 30 days

Percentile

51%

Versus all other CVEs

30-day change

0.00 pp

From 0.67% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.67%

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

Affected systems

Microsoft8 products

1 vendor · 8 products

References

1 links