The Internet Key Exchange version 1 (IKEv1) implementations in Fortinet FortiOS 2.50 2.80 and 3.0 FortiClient 2.0 ; and FortiManager 2.80 and 3.0 allow remote attackers to cause a denial of service (termination of a process that is automatically restarted) via IKE packets with invalid values of certain IPSec attributes as demonstrated by the PROTOS ISAKMP Test Suite for IKEv1. NOTE: due to the lack of details in the vendor advisory it is unclear which of CVE-2005-3666 CVE-2005-3667 and/or CVE-2005-3668 this issue applies to.