Vulnerability in Microsoft Edge Update
CVE-2025-21399
Microsoft Edge (Chromium-based) Update Elevation of Privilege Vulnerability
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (50.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Microsoft Edge Update
- Microsoft Edge Update Setup — versions 1.0.0.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21399 (vendor-advisory, patch, Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Exploit, Third Party Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-21399?
- CVE-2025-21399 is a high-severity vulnerability in Microsoft Edge Update, classified under Untrusted Search Path. CVSS score: 7.4/10. Published 2025-01-17.
- How severe is CVE-2025-21399?
- High severity. CVSS v3 base score is 7.4 out of 10.
- Is CVE-2025-21399 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.