Potential Execution Risk in Firefox from Incomplete File Saving
CVE-2025-6435

8.1HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
24 June 2025

What is CVE-2025-6435?

A vulnerability in Firefox allows users to save responses from the Network tab in Devtools without the proper .download file extension. This mismanagement may inadvertently enable the execution of malicious executables, posing a security threat to users. The issue affects Firefox versions prior to 140, highlighting the importance of secure file handling practices in web browsers.

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Affected Version(s)

Firefox < 140

Thunderbird < 140

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1950056
https://bugzilla.mozilla.org/show_bug.cgi?id=1961777
https://www.mozilla.org/security/advisories/mfsa2025-51/

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Ameen Basha M K
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