CVE-2025-65513 identifies a Server-Side Request Forgery (SSRF) vulnerability in fetch-mcp versions 1.0.2 and earlier. SSRF vulnerabilities occur when an attacker can induce a server-side application to make HTTP requests to arbitrary domains, often bypassing network restrictions. In this case, the vulnerability specifically allows attackers to bypass private IP validation mechanisms implemented by fetch-mcp, which are intended to prevent access to internal network resources such as intranet services, databases, or cloud metadata endpoints. By exploiting this flaw, an attacker can craft malicious requests that the vulnerable server processes, enabling them to reach internal systems that are otherwise inaccessible from the outside. This can lead to unauthorized data exposure, reconnaissance of internal network topology, or pivoting attacks. The vulnerability is remotely exploitable without requiring authentication or user interaction, increasing its risk profile. The CVSS v3.1 base score is 7.5, reflecting high severity due to the ease of exploitation and the potential impact on confidentiality. No patches or exploit code are currently publicly available, but the vulnerability is officially published and should be addressed proactively. The CWE-918 classification confirms this as a classic SSRF issue. Organizations using fetch-mcp should monitor for updates and prepare to implement mitigations to prevent internal network compromise.

For European organizations, the impact of CVE-2025-65513 can be significant, especially for those relying on fetch-mcp in environments that handle sensitive or regulated data. The ability to bypass private IP validation means attackers could access internal services that are not intended to be exposed externally, potentially leading to data breaches or unauthorized information gathering. This is particularly critical for sectors such as finance, healthcare, government, and critical infrastructure, where internal network confidentiality is paramount. The vulnerability does not directly affect system integrity or availability but compromises confidentiality, which can have cascading effects such as enabling further attacks or regulatory non-compliance under GDPR. Organizations with complex internal networks or cloud environments that use fetch-mcp for internal communications or API calls are at heightened risk. The lack of known exploits in the wild provides a window for proactive defense, but the remote and unauthenticated nature of the vulnerability demands urgent attention to prevent exploitation.

1. Monitor the fetch-mcp project and vendor channels closely for official patches or updates addressing CVE-2025-65513 and apply them immediately upon release. 2. Until patches are available, implement strict egress and ingress network filtering to restrict the vulnerable server's ability to make outbound requests to internal IP ranges or sensitive endpoints. 3. Employ Web Application Firewalls (WAFs) or Intrusion Detection/Prevention Systems (IDS/IPS) configured to detect and block SSRF attack patterns targeting fetch-mcp. 4. Conduct thorough internal network segmentation to minimize the exposure of critical services to potentially compromised servers. 5. Review and harden application-level input validation to ensure that URLs or request parameters processed by fetch-mcp cannot be manipulated to access internal resources. 6. Use runtime application self-protection (RASP) tools where possible to detect anomalous request behaviors indicative of SSRF exploitation attempts. 7. Perform regular security assessments and penetration tests focusing on SSRF vectors to identify and remediate similar weaknesses proactively.