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.
History

Tue, 15 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.00056}

epss

{'score': 0.00061}


Mon, 14 Jul 2025 18:45:00 +0000

Type Values Removed Values Added
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 affects Firefox < 140. 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.
References

Thu, 03 Jul 2025 16:30:00 +0000

Type Values Removed Values Added
First Time appeared Mozilla
Mozilla firefox
CPEs cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
Vendors & Products Mozilla
Mozilla firefox

Thu, 26 Jun 2025 00:30:00 +0000

Type Values Removed Values Added
Title firefox: Save as in Devtools could download files without sanitizing the extension
References
Metrics threat_severity

None

threat_severity

Low


Tue, 24 Jun 2025 14:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-434
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 24 Jun 2025 12:45:00 +0000

Type Values Removed Values Added
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 affects Firefox < 140.
References

cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published: 2025-06-24T12:28:04.603Z

Updated: 2025-07-14T18:26:53.836Z

Reserved: 2025-06-20T14:51:42.561Z

Link: CVE-2025-6435

cve-icon Vulnrichment

Updated: 2025-06-24T13:39:11.564Z

cve-icon NVD

Status : Modified

Published: 2025-06-24T13:15:24.560

Modified: 2025-07-14T19:15:35.277

Link: CVE-2025-6435

cve-icon Redhat

Severity : Low

Publid Date: 2025-06-24T12:28:04Z

Links: CVE-2025-6435 - Bugzilla