CVE-2025-1019

low-risk

Published 2025-02-04

The z-order of the browser windows could be manipulated to hide the fullscreen notification. This could potentially be leveraged to perform a spoofing attack. This vulnerability was fixed in Firefox 135 and Thunderbird 135.

Do I need to act?

0.30% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 4.3/10 Medium

NETWORK / LOW complexity

Affected Products (2)

Firefox

Thunderbird

Affected Vendors

Mozilla

References (3)

Permissions Required https://bugzilla.mozilla.org/show_bug.cgi?id=1940162

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2025-07/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2025-11/

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low-risk

Severity 18/34 · Moderate

Exploitability 1/34 · Minimal

Exposure 7/34 · Low