CVE-2018-13372 was initially reported as a vulnerability associated with Fortinet products, as indicated by the assigner short name 'fortinet'. However, the vulnerability entry has been marked with the state 'REJECTED', which typically means that after review, the reported issue was either determined not to be a valid vulnerability, was a duplicate, or was otherwise invalidated by the vendor or the CVE Numbering Authority. There are no technical details, affected versions, or patch information provided, and no known exploits in the wild have been reported. The absence of a CVSS score and the lack of additional information suggest that this CVE entry does not represent an active or exploitable security threat. Given the lack of concrete technical data, it is not possible to provide a detailed technical explanation of the vulnerability itself. The rejection status indicates that organizations should not consider this a current security risk but should continue to monitor official vendor advisories for any updates.

Since CVE-2018-13372 has been marked as 'REJECTED' and lacks technical details or evidence of exploitation, it poses no known impact to confidentiality, integrity, or availability of systems. European organizations are not at risk from this specific CVE, and there is no indication that any Fortinet products or other systems are vulnerable under this identifier. Therefore, no direct impact on European entities can be assessed. Organizations should maintain standard security practices for Fortinet products and remain vigilant for any future advisories but do not need to take action based on this CVE entry.

No specific mitigation actions are required for CVE-2018-13372 due to its rejected status. European organizations should continue to follow best practices for managing Fortinet devices, including applying all official patches and updates released by Fortinet, conducting regular security assessments, and monitoring threat intelligence feeds for any new vulnerabilities. It is recommended to verify the firmware and software versions of Fortinet products in use and ensure they are up to date according to vendor guidance. Additionally, maintaining robust network segmentation, access controls, and logging will help mitigate risks from other potential vulnerabilities.