CVEvulnerability
CVE-2025-6435
8.1 HIGH
Official page ↗
- Status
- Modified
- Published
- 2025-06-24
- Last modified
- 2026-09-30
- Assigner
- [email protected]
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 8.1 HIGH — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-434
Description
If a user saved a response from the Network tab in Devtools using the Save As context menu option, that file may not have been saved with the `.download` file extension. This could have led to the user inadvertently running a malicious executable. This vulnerability was fixed in Firefox 140 and Thunderbird 140.
Affected configurations
• mozilla firefox (< 140.0)
• mozilla thunderbird (< 140.0)
Related
Weakness · CWE (1)
- CWE-434 Unrestricted Upload of File with Dangerous Type weakness
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1950056 Permissions Required
- https://bugzilla.mozilla.org/show_bug.cgi?id=1961777 Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2025-51/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-54/ Vendor Advisory