Vulnerability in Mozilla Firefox
CVE-2025-3033
After selecting a malicious Windows `.url` shortcut from the local filesystem, an unexpected file could be uploaded. *This bug only affects Firefox on Windows. Other operating systems are unaffected.*. This vulnerability was fixed in Firefox 137 and Thunderbird 137.
EPSS: 0.002 (6.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
Affected products
- Mozilla Firefox — versions 137
- Mozilla Thunderbird — versions 137
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@mozilla.org (Permissions Required, Issue Tracking)
- security@mozilla.org (Vendor Advisory)
- security@mozilla.org (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-3033?
- CVE-2025-3033 is a high-severity vulnerability in Mozilla Firefox, classified under External Control of File Name or Path. CVSS score: 7.7/10. Published 2025-04-01.
- How severe is CVE-2025-3033?
- High severity. CVSS v3 base score is 7.7 out of 10.
- Is CVE-2025-3033 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.