CVE-2025-27216 is a high-severity vulnerability identified in the Ubiquiti Inc UISP Application version 2.4.220. The vulnerability is classified under CWE-732, which pertains to Incorrect Permission Assignment for a Critical Resource. This flaw allows a malicious actor who already has certain limited permissions within the UISP Application to escalate their privileges further without requiring user interaction. The vulnerability arises due to improper permission configurations on critical resources, enabling privilege escalation that can compromise confidentiality, integrity, and availability of the system. The CVSS v3.1 base score is 8.8, indicating a high impact with network attack vector (AV:N), low attack complexity (AC:L), requiring privileges (PR:L), no user interaction (UI:N), unchanged scope (S:U), and high impact on confidentiality (C:H), integrity (I:H), and availability (A:H). Although no known exploits are currently reported in the wild, the vulnerability presents a significant risk due to the potential for attackers to gain elevated access and control over the UISP Application environment. UISP (Ubiquiti Internet Service Provider) Application is widely used for managing network devices and infrastructure, making this vulnerability critical for organizations relying on Ubiquiti's network management solutions.

For European organizations, the impact of this vulnerability could be substantial, especially for ISPs, managed service providers, and enterprises that utilize Ubiquiti UISP for network management. Successful exploitation could lead to unauthorized privilege escalation, allowing attackers to manipulate network configurations, disrupt services, or exfiltrate sensitive network data. This could result in network downtime, data breaches, and loss of trust from customers and partners. Given the critical role of network management applications in maintaining operational continuity, exploitation could also affect availability of network services, impacting business operations and potentially critical infrastructure. Additionally, the high confidentiality impact means sensitive configuration and operational data could be exposed, increasing the risk of further targeted attacks. The lack of known exploits in the wild currently provides a window for mitigation, but the ease of exploitation (low complexity) and network attack vector heighten urgency for European organizations to address this vulnerability promptly.

To mitigate CVE-2025-27216, European organizations should immediately verify if they are running UISP Application version 2.4.220 and prioritize upgrading to a patched version once available from Ubiquiti. In the absence of an official patch, organizations should implement strict access controls to limit permissions granted to users within the UISP Application, ensuring the principle of least privilege is enforced. Conduct thorough audits of user roles and permissions to identify and remediate any excessive privileges. Network segmentation should be employed to restrict access to the UISP management interface only to trusted administrative hosts and networks. Monitoring and logging of administrative actions within UISP should be enhanced to detect anomalous privilege escalation attempts. Additionally, organizations should consider deploying intrusion detection/prevention systems (IDS/IPS) tuned to detect suspicious activities targeting UISP components. Regular backups of UISP configurations and network device states should be maintained to enable rapid recovery in case of compromise. Finally, organizations should stay informed via Ubiquiti security advisories and subscribe to threat intelligence feeds to respond swiftly to any emerging exploit developments.