CVE-2025-1018
Published: 04 February 2025
Summary
CVE-2025-1018 is a medium-severity Improper Restriction of Rendered UI Layers or Frames (CWE-1021) vulnerability in Mozilla Firefox. Its CVSS base score is 5.3 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Masquerading (T1036); ranked at the 39.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-2 (Flaw Remediation) and RA-5 (Vulnerability Monitoring and Scanning).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Directly remediates the fullscreen notification vulnerability by requiring timely patching to Firefox and Thunderbird version 135 or later.
Ensures organizations receive and act on Mozilla security advisories like MFSA 2025-07 to apply fixes for this specific CVE.
Detects deployed instances of vulnerable Firefox and Thunderbird versions prior to 135 through vulnerability scanning.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Fullscreen notification spoofing directly enables UI masquerading to deceive users.
NVD Description
The fullscreen notification is prematurely hidden when fullscreen is re-requested quickly by the user. This could have been leveraged to perform a potential spoofing attack. This vulnerability was fixed in Firefox 135 and Thunderbird 135.
Deeper analysisAI
CVE-2025-1018 is a vulnerability in the fullscreen notification handling mechanism within Mozilla Firefox and Thunderbird. The issue occurs when the fullscreen notification is prematurely hidden upon quick re-requests for fullscreen by the user, enabling a potential spoofing attack. This flaw affects versions of Firefox and Thunderbird prior to 135 and is associated with CWE-1021, with a CVSS v3.1 base score of 5.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N).
Remote attackers can exploit this vulnerability over the network with low attack complexity, requiring no privileges or specific user interaction beyond normal browser usage. Successful exploitation allows attackers to achieve low-impact integrity violations through spoofing, such as manipulating fullscreen notifications to deceive users.
Mozilla fixed this vulnerability in Firefox 135 and Thunderbird 135. Mitigation details are provided in security advisories MFSA 2025-07 and MFSA 2025-11, along with the Bugzilla entry at https://bugzilla.mozilla.org/show_bug.cgi?id=1910818.
Details
- CWE(s)