Advisory Details

July 29th, 2025

Mozilla Firefox Web Page Download Mark-Of-The-Web Protection Mechanism Failure Vulnerability

ZDI-25-708
ZDI-CAN-22536

CVE ID CVE-2024-3863
CVSS SCORE 7.5, AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
AFFECTED VENDORS Mozilla
AFFECTED PRODUCTS Firefox
VULNERABILITY DETAILS

This vulnerability allows remote attackers to bypass the Mark-Of-The-Web protection mechanism on affected installations of Mozilla Firefox. User interaction is required to exploit this vulnerability in that the target must perform a specific action on a malicious page.

The specific flaw exists within the web page download functionality. An attacker can abuse the functionality to create files without the Mark-Of-The-Web. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the current user.

ADDITIONAL DETAILS Mozilla has issued an update to correct this vulnerability. More details can be found at:
https://www.mozilla.org/en-US/security/advisories/mfsa2024-18/#CVE-2024-3863
DISCLOSURE TIMELINE
  • 2024-02-13 - Vulnerability reported to vendor
  • 2025-07-29 - Coordinated public release of advisory
  • 2025-07-29 - Advisory Updated
CREDIT Eduardo Braun Prado
BACK TO ADVISORIES