CVE-2025-34314 is a stored cross-site scripting (XSS) vulnerability affecting IPFire, an open-source firewall distribution, in versions prior to 2.29 (Core Update 198). The vulnerability arises from improper neutralization of input during web page generation (CWE-79). Specifically, when an authenticated user creates a time constraint rule via the web interface, the application accepts SRC (source), DST (destination), and COMMENT parameters through an HTTP POST request to /cgi-bin/urlfilter.cgi with the MODE parameter set to TIMECONSTRAINT. These parameters are stored and later rendered in the web interface without adequate input sanitization or output encoding. Consequently, an attacker with valid credentials can inject malicious JavaScript code into these fields. When other users view the affected time constraint entries, the injected scripts execute in their browsers within the security context of the IPFire web interface. This can lead to session hijacking, unauthorized actions, or information disclosure. The vulnerability requires authentication but no elevated privileges, and user interaction is needed to trigger the malicious script execution. The CVSS 4.0 vector indicates network attack vector, low attack complexity, no privileges required beyond authentication, and user interaction required. The vulnerability does not affect confidentiality, integrity, or availability directly but poses a risk to user session integrity and trustworthiness of the web interface. No patches or exploits are currently publicly available, but the risk remains significant for environments relying on IPFire for perimeter security.

For European organizations, the impact of CVE-2025-34314 can be significant in environments where IPFire is deployed as a firewall or network security appliance with web-based management. Successful exploitation could allow attackers to execute arbitrary JavaScript in the context of other authenticated users, potentially leading to session hijacking, credential theft, or unauthorized configuration changes. This undermines the integrity and trust of the firewall management interface, possibly resulting in network security policy bypass or compromise. Organizations with multiple administrators or users managing IPFire devices are at higher risk, as injected scripts could propagate through shared management consoles. Although the vulnerability does not directly affect network traffic filtering or availability, the indirect consequences of compromised administrative sessions could lead to broader security breaches. Given the medium CVSS score and requirement for authentication, the threat is moderate but should not be underestimated, especially in critical infrastructure or government networks where IPFire is used. The absence of known exploits in the wild provides a window for proactive mitigation.

To mitigate CVE-2025-34314, European organizations should prioritize upgrading IPFire installations to version 2.29 (Core Update 198) or later, where this vulnerability is addressed. In the absence of an official patch, administrators should restrict access to the IPFire web interface to trusted networks and users only, employing network segmentation and VPNs to limit exposure. Implement strong authentication mechanisms, such as multi-factor authentication, to reduce the risk of unauthorized access. Regularly audit and monitor time constraint rules and other user-generated content for suspicious entries that could indicate attempted exploitation. Additionally, applying Content Security Policy (CSP) headers on the IPFire web interface, if configurable, can help mitigate the impact of injected scripts. Educate administrators about the risks of XSS and encourage cautious handling of user input fields. Finally, maintain up-to-date backups of configuration data to enable rapid recovery if compromise occurs.