Für alle, die auf Ihrer Fortigate seit dem Update auf v4.2 eine hohe CPU Last bemerken und noch nicht im Customer Support Bulletin von Ihrem Support Account nachgeschaut haben:
Subject: High CPU with IPS engine enabled
Released: April 22, 2010
Modified: April 27, 2010
After upgrading a FortiGate device to v4.0 MR2 (B0272), under certain conditions the CPU may spike to over 90%. The issue is caused by a bug in the MIME parser of the IPS engine code when handling the header line of some emails. Some cases have been reported to FortiCare support where the CPU usage returns to a normal state on its own after a short period.
All FortiGate models running FortiOS v4.0 MR2 B0272 and using IPS Engine version 1.161.
This problem is fixed with an interim IPS engine that is available from Customer Support for manual update. A updated IPS engine, version 1.163, will be released to customers running FortiOS v4.0 MR2 by Tuesday, May 11, 2010.