Thanks cheekymonkey & Andrew Hodes
Title: Malformed Mail Attribute can Cause Exchange 2000 to
Exhaust CPU Resources (Q320436)
Date: 29 May 2002
Software: Microsoft Exchange
Impact: Denial of Service
Max Risk: Critical
Bulletin: MS02-025
Issue:
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To support the exchange of mail with heterogeneous systems, Exchange messages use the attributes of SMTP mail messages that are specified by RFC's 821 and 822. There is a flaw in the way Exchange 2000 handles certain malformed RFC message attributes on received mail. Upon receiving a message containing such a malformation, the flaw causes the Store service to consume 100% of the available CPU in processing the message.
News source: Microsoft Security Bulletin MS02-025
Download: 
