The CVE identifier CVE-2026-21747 was reserved on January 5, 2026, by Fortinet but subsequently marked as REJECTED, indicating that the vulnerability report was invalid, duplicate, or otherwise not accepted as a valid security issue. The lack of technical details, affected product versions, or exploit information suggests that this CVE entry does not correspond to a confirmed vulnerability. No CVSS score has been assigned, and there are no known exploits in the wild. The absence of patch links and indicators further supports that this is not an active or credible threat. As such, this CVE should be considered a non-threat in its current state.

Given the rejection status and lack of technical details, there is no known impact associated with CVE-2026-21747. No confidentiality, integrity, or availability concerns have been documented. European organizations are not at risk from this entry, and no operational impact is expected. Monitoring for future updates is advisable but no immediate action is warranted.

No specific mitigation measures are required for CVE-2026-21747 due to its rejected status and absence of a confirmed vulnerability. Organizations should maintain standard security hygiene and stay informed through official vendor and CVE databases for any future developments or related advisories. If any new information emerges, appropriate patching and mitigation steps should be followed accordingly.