Overview
The vulnerability CVE-2025-55029 is a serious issue that affects Firefox for iOS versions prior to 142. This flaw enables malicious scripts to bypass the browser’s native popup blocker, leading to the potential bombardment of new tabs. Such an action can trigger a denial-of-service (DoS) attack, compromising the system’s functionality and possibly leading to data leakage. This vulnerability is a significant concern for all users of the affected Firefox versions on iOS, as it can significantly disrupt the user experience and potentially compromise sensitive data.
Vulnerability Summary
CVE ID: CVE-2025-55029
Severity: High (7.5/10)
Attack Vector: Network
Privileges Required: None
User Interaction: Required
Impact: Denial of service, potential system compromise, and data leakage
Affected Products
Escape the Surveillance Era
Most apps won’t tell you the truth.
They’re part of the problem.
Phone numbers. Emails. Profiles. Logs.
It’s all fuel for surveillance.
Ameeba Chat gives you a way out.
- • No phone number
- • No email
- • No personal info
- • Anonymous aliases
- • End-to-end encrypted
Chat without a trace.
Product | Affected Versions
Firefox for iOS | Versions prior to 142
How the Exploit Works
The exploit works by taking advantage of a flaw in the popup blocker of Firefox for iOS. The attacker crafts malicious scripts that can bypass the popup blocker, leading to an excessive generation of new tabs. This can overwhelm the system, leading to a denial of service. The vulnerability could potentially be further exploited to achieve system compromise or data leakage.
Conceptual Example Code
A malicious script example that could exploit this vulnerability might look something like this:
while (true) {
window.open('http://malicious-website.com');
}This simple script would continuously open new tabs pointing to ‘http://malicious-website.com’, leading to the aforementioned DoS state.
Mitigation Guidance
Users are strongly advised to update Firefox for iOS to the latest version to fix this vulnerability. In cases where immediate patching is not feasible, implementing a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) may serve as a temporary mitigation strategy. They can help detect and prevent the execution of the malicious scripts associated with this vulnerability.
