CVE-2025-61891 is a vulnerability identifier that was reserved by Fortinet on October 3, 2025, but the entry has been marked with a state of "REJECTED" in the CVE database. The lack of technical details, absence of affected versions, no patch links, and no known exploits in the wild indicate that this CVE entry does not correspond to an actual confirmed security vulnerability. The rejection status typically means that the CVE request was invalid, duplicate, or otherwise not accepted as a valid vulnerability record. Consequently, there is no technical information available to describe the nature of the vulnerability, its attack vector, or its potential impact. Without any data on affected products or exploitability, it is not possible to provide a detailed technical explanation of a threat or vulnerability here.

Given that CVE-2025-61891 is marked as REJECTED and lacks any technical or exploit information, there is no demonstrated or potential impact to analyze. European organizations, or any organizations globally, are not at risk from this non-existent or invalid vulnerability. No confidentiality, integrity, or availability concerns arise from this entry.

Since this CVE entry is rejected and does not represent a valid vulnerability, no specific mitigation actions are required. Organizations should continue to follow standard cybersecurity best practices and maintain up-to-date patching and vulnerability management processes for their actual systems and software. Monitoring official advisories from Fortinet and other vendors remains important to respond promptly to genuine vulnerabilities.