CVE-2025-55029

HIGH

Firefox < 142.0 - Denial of Service via Popup Blocker Bypass

Title source: llm
STIX 2.1

Description

Malicious scripts could bypass the popup blocker to spam new tabs, potentially resulting in denial of service attacks. This vulnerability was fixed in Firefox for iOS 142.

References (2)

Core 2
Core References
Issue Tracking, Permissions Required
https://bugzilla.mozilla.org/show_bug.cgi?id=1973577

Scores

CVSS v3 7.5
EPSS 0.0011
EPSS Percentile 28.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-400
Status published
Products (2)
mozilla/firefox < 142.0
Mozilla/Firefox for iOS 142
Published Aug 19, 2025
Tracked Since Feb 18, 2026