CVE-2025-27217 is a Server-Side Request Forgery (SSRF) vulnerability identified in the Ubiquiti Inc UISP Application, specifically affecting version 2.4.220. SSRF vulnerabilities occur when an attacker can abuse a server to send crafted requests to internal or external systems that the server itself can access but the attacker normally cannot. In this case, the vulnerability allows a malicious actor who already has certain permissions within the UISP Application to make unauthorized requests outside the intended scope of the application. This means the attacker could potentially interact with internal network resources, access sensitive internal services, or exfiltrate data by leveraging the UISP server as a proxy. The vulnerability does not require user interaction beyond the attacker having some level of permission, which implies that exploitation is limited to authenticated users with specific privileges. No known public exploits have been reported yet, and no CVSS score has been assigned. The lack of a patch link suggests that a fix may not yet be publicly available or is in development. UISP (Ubiquiti Internet Service Provider) Application is a network management platform used by ISPs and enterprises to manage Ubiquiti network devices, making it a critical component in network infrastructure management. SSRF vulnerabilities in such applications are particularly dangerous because they can be leveraged to pivot into internal networks, bypass firewall restrictions, or access metadata services in cloud environments, leading to potential data breaches or further compromise.

For European organizations using the UISP Application, this SSRF vulnerability poses significant risks. Since UISP is used to manage network devices and infrastructure, exploitation could allow attackers to access internal network services that are otherwise protected, potentially leading to unauthorized data access, network reconnaissance, or lateral movement within the network. This could compromise confidentiality and integrity of sensitive data and disrupt availability if critical network management functions are affected. Given the role of UISP in ISP and enterprise network management, exploitation could impact service delivery, customer data, and operational continuity. The threat is heightened in environments where UISP is integrated with other critical systems or cloud services, as SSRF can be used to access internal cloud metadata endpoints, leading to credential theft or privilege escalation. European organizations with stringent data protection regulations (e.g., GDPR) could face compliance issues and reputational damage if such a vulnerability is exploited. The absence of known exploits suggests a window of opportunity for proactive mitigation before widespread attacks occur.

1. Immediate mitigation should include restricting UISP Application permissions to the minimum necessary users to reduce the attack surface. 2. Network segmentation should be enforced so that the UISP server has limited access to internal resources, minimizing the impact of SSRF exploitation. 3. Implement strict input validation and output encoding on any user-controllable parameters that can influence server requests within UISP. 4. Monitor network traffic originating from the UISP server for unusual or unauthorized outbound requests that could indicate exploitation attempts. 5. Apply firewall rules to restrict the UISP server’s ability to make arbitrary outbound requests, especially to internal IP ranges or sensitive endpoints. 6. Stay updated with Ubiquiti’s security advisories and apply patches promptly once available. 7. Conduct regular security audits and penetration testing focusing on SSRF and related vulnerabilities in network management applications. 8. Consider deploying Web Application Firewalls (WAF) or Intrusion Detection Systems (IDS) tuned to detect SSRF patterns targeting UISP.