CVE-2025-25207 is a medium severity vulnerability affecting the Authorino service within the Red Hat Connectivity Link platform. Authorino functions as an authorization service designed to enforce zero trust API security by allowing developers to add callbacks that execute HTTP requests after the authorization process completes. The vulnerability arises because an attacker with developer persona access can exploit the system by registering an excessive number of post-authorization callbacks. Since the authorization policy enforcement is handled by a single instance of the Authorino service, this uncontrolled resource consumption leads to a Denial of Service (DoS) condition. Specifically, the service becomes overwhelmed while processing the large volume of callbacks, resulting in degraded performance or complete unavailability of the authorization service. The CVSS 3.1 base score of 5.7 reflects a medium severity, with the attack vector being adjacent network (AV:A), low attack complexity (AC:L), requiring privileges (PR:L) but no user interaction (UI:N). The impact is limited to availability (A:H), with no confidentiality or integrity impact. This vulnerability is present in version 1.0.1 of Authorino, and no known exploits have been reported in the wild as of the publication date. The core issue is insufficient controls on the number of callbacks a developer can register, allowing resource exhaustion on the single-instance service responsible for enforcing authorization policies.

For European organizations leveraging Red Hat Connectivity Link and specifically the Authorino service for zero trust API security, this vulnerability poses a risk of service disruption. The denial of service could prevent legitimate authorization requests from being processed, effectively blocking access to critical APIs and services. This could impact business operations, especially for organizations relying on real-time API interactions for customer-facing applications, internal workflows, or inter-service communications. The attack requires developer persona access, which means insider threats or compromised developer credentials could be exploited. While confidentiality and integrity are not directly impacted, the availability loss could lead to operational downtime, potential SLA breaches, and reputational damage. Organizations in sectors such as finance, telecommunications, and government, where API security and availability are paramount, may experience significant operational challenges if this vulnerability is exploited.

To mitigate this vulnerability, European organizations should implement strict governance and monitoring of developer persona privileges to prevent unauthorized or excessive callback registrations. Specifically, enforce limits on the number of callbacks a developer can register per authorization policy to prevent resource exhaustion. Deploy rate limiting and anomaly detection mechanisms on the Authorino service to identify and block unusual callback registration patterns. Consider scaling the authorization service horizontally or implementing a distributed architecture to avoid single points of failure. Regularly update Authorino to the latest patched versions once available from Red Hat. Additionally, implement robust credential management and access controls to minimize the risk of developer account compromise. Conduct periodic audits of callback configurations and monitor service performance metrics to detect early signs of resource exhaustion. Finally, establish incident response procedures to quickly remediate any denial of service events related to this vulnerability.