CVE-2025-6435

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2025-6435
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 affects Firefox < 140 and Thunderbird < 140.

8.1 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 2.2 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
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/
Configurations

Configuration 1 (hide)

cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
History

14 Jul 2025, 19:15

Type Values Removed Values Added
References
  • () https://www.mozilla.org/security/advisories/mfsa2025-54/ -
Summary (en) 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 affects Firefox < 140. (en) 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 affects Firefox < 140 and Thunderbird < 140.

03 Jul 2025, 16:09

Type Values Removed Values Added
References () https://bugzilla.mozilla.org/show_bug.cgi?id=1950056 - () https://bugzilla.mozilla.org/show_bug.cgi?id=1950056 - Permissions Required
References () https://bugzilla.mozilla.org/show_bug.cgi?id=1961777 - () https://bugzilla.mozilla.org/show_bug.cgi?id=1961777 - Permissions Required
References () https://www.mozilla.org/security/advisories/mfsa2025-51/ - () https://www.mozilla.org/security/advisories/mfsa2025-51/ - Vendor Advisory
First Time Mozilla
Mozilla firefox
CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*

26 Jun 2025, 18:58

Type Values Removed Values Added
Summary
  • (es) Si un usuario guardó una respuesta desde la pestaña Red en DevTools mediante la opción Guardar como del menú contextual, es posible que el archivo no se haya guardado con la extensión `.download`. Esto podría haber provocado que el usuario ejecutara accidentalmente un archivo malicioso. Esta vulnerabilidad afecta a Firefox anterior a la versión 140.

24 Jun 2025, 14:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-06-24 13:15

Updated : 2025-07-14 19:15

NVD link : CVE-2025-6435

Mitre link : CVE-2025-6435

CVE.ORG link : CVE-2025-6435

JSON object : View

Products Affected

mozilla

  • firefox
CWE
CWE-434

Unrestricted Upload of File with Dangerous Type