CVE-2025-55029 is a vulnerability identified in Mozilla Firefox for iOS versions earlier than 142. The flaw allows malicious web scripts to circumvent the browser's popup blocker mechanism, which normally prevents websites from opening multiple unsolicited tabs. By exploiting this bypass, attackers can cause the browser to spawn an excessive number of new tabs, leading to resource exhaustion on the device. This results in a denial of service (DoS) condition where the device may become unresponsive or crash due to overwhelmed CPU, memory, or battery resources. The vulnerability is remotely exploitable over the network without requiring any privileges or user interaction, increasing its risk profile. The underlying weakness relates to improper handling of popup blocking logic, categorized under CWE-400 (Uncontrolled Resource Consumption). Although no public exploits have been reported, the vulnerability's characteristics suggest it could be leveraged in drive-by attacks or malicious websites targeting Firefox for iOS users. The absence of a patch link indicates that a fix may be pending or recently released. Organizations relying on Firefox for iOS should prioritize updating to mitigate potential disruptions. This vulnerability primarily threatens availability, with no direct impact on confidentiality or integrity.

For European organizations, this vulnerability poses a risk of denial of service on iOS devices running Firefox, potentially disrupting business operations that depend on mobile browsing. Employees using vulnerable versions may experience device slowdowns, crashes, or battery drain, reducing productivity. In sectors where mobile access to web applications is critical, such as finance, healthcare, or government, this could hinder timely access to information or services. Additionally, widespread exploitation could lead to increased support costs and operational overhead. While the vulnerability does not compromise data confidentiality or integrity, the availability impact alone can have significant operational consequences. Organizations with Bring Your Own Device (BYOD) policies or those issuing iOS devices with Firefox installed are particularly at risk. The threat is amplified in environments with high mobile workforce mobility and reliance on iOS platforms.

1. Immediately update Mozilla Firefox for iOS to version 142 or later once the patch is available to ensure the popup blocker bypass is fixed. 2. Until updates are deployed, implement Mobile Device Management (MDM) policies to restrict or monitor Firefox usage on corporate iOS devices. 3. Educate users about the risks of visiting untrusted websites and encourage cautious browsing behavior on mobile devices. 4. Use network-level web filtering to block access to known malicious sites that could exploit this vulnerability. 5. Monitor device performance and browser behavior for signs of abnormal tab spawning or resource exhaustion. 6. Coordinate with IT and security teams to develop incident response plans for potential DoS events on mobile devices. 7. Consider alternative browsers with robust popup blocking if immediate patching is not feasible. 8. Regularly review and update mobile security policies to incorporate emerging threats targeting iOS applications.