[原文]Microsoft Exchange Server 5.5 does not properly handle a MIME header with a blank charset specified, which allows remote attackers to cause a denial of service via a charset="" command, aka the "Malformed MIME Header" vulnerability.
Exchange contains a flaw that may allow a remote denial of service. The issue is triggered when a specially crafted email is sent, which contains specific malformed MIME headers, and will result in loss of availability for the service.
Currently, there are no known workarounds or upgrades to correct this issue. However, Microsoft has released a patch to address this vulnerability.