CVE-2025-13502 is a vulnerability identified in the WebKitGTK and WPE WebKit components integrated within Red Hat Enterprise Linux 6. The flaw arises from an integer overflow or wraparound condition that leads to an out-of-bounds read and an integer underflow. This memory mismanagement causes the UIProcess, a critical component responsible for rendering and user interface operations, to crash, resulting in a denial-of-service (DoS) condition. The vulnerability is exploitable remotely without requiring any privileges or user interaction by sending a crafted payload to the GLib remote inspector server, a debugging interface used for inspecting WebKit processes. The CVSS v3.1 base score of 7.5 reflects the high severity due to the ease of remote exploitation and the impact on system availability. While the vulnerability does not compromise confidentiality or integrity, the DoS effect can disrupt services relying on the WebKit rendering engine. No patches or known exploits are currently reported, but the risk remains significant for systems still running Red Hat Enterprise Linux 6, which is an older but still in-use enterprise OS version. The vulnerability highlights the risks of exposing debugging interfaces like the GLib remote inspector server to untrusted networks.

For European organizations, the primary impact of CVE-2025-13502 is the potential denial-of-service on systems running Red Hat Enterprise Linux 6 with WebKitGTK or WPE WebKit components. This can disrupt web-based applications or services that rely on these components for rendering or UI processes, potentially affecting internal tools, customer-facing portals, or embedded systems. Critical sectors such as finance, manufacturing, and government that use legacy Red Hat Enterprise Linux 6 deployments may experience service outages, impacting business continuity and operational efficiency. Since the vulnerability can be exploited remotely without authentication, attackers could cause widespread disruption if the GLib remote inspector server is exposed to untrusted networks. Although no data breach or code execution is involved, the availability impact can lead to reputational damage and financial losses. The lack of known exploits in the wild provides a window for proactive mitigation, but organizations must act swiftly to prevent exploitation.

Organizations should immediately audit their Red Hat Enterprise Linux 6 systems to identify the presence of WebKitGTK and WPE WebKit components and whether the GLib remote inspector server is enabled and accessible remotely. Network-level controls should be implemented to restrict access to the GLib remote inspector server, ideally limiting it to trusted internal networks or disabling it entirely if not required. Monitoring and logging should be enhanced to detect unusual or malformed payloads targeting the inspector server. Since no patch links are currently available, organizations should track Red Hat advisories closely and apply security updates as soon as they are released. For longer-term mitigation, consider upgrading from Red Hat Enterprise Linux 6 to a supported version to benefit from improved security and support. Additionally, employing application-layer firewalls or intrusion prevention systems to detect and block suspicious traffic targeting WebKit components can reduce exposure.