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CVE-2025-55029: Denial of Service Vulnerability in Firefox for iOS

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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

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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.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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