The CVE identifier CVE-2025-66187 was reserved by Fortinet but subsequently rejected, indicating that the vulnerability report was either invalid, duplicate, or otherwise not accepted into the CVE database. No technical details, affected product versions, or exploit information have been published. The lack of a CVSS score and absence of patch or mitigation guidance further suggest that this entry does not correspond to a confirmed or exploitable vulnerability. Without concrete data on the nature of the vulnerability, its attack vector, or impact, it is not possible to provide a detailed technical explanation. The rejection status implies that this CVE should not be treated as a current security threat.

Given the rejection status and absence of technical details or known exploits, there is no identifiable impact on confidentiality, integrity, or availability. European organizations are not at risk from this CVE as it does not represent a confirmed vulnerability. No disruption to systems or data compromise can be attributed to this entry. Therefore, the potential impact is effectively null at this time.

No specific mitigation actions are necessary due to the rejection of this CVE and lack of technical details. Organizations should continue to maintain standard security hygiene, including timely patching of Fortinet products and monitoring vendor advisories for any new confirmed vulnerabilities. It is advisable to subscribe to official Fortinet security bulletins and CVE databases to receive updates in case this or related issues are reclassified or new information emerges.