The Microsoft Exchange System Attendant in Microsoft Exchange Server 2000 contains a flaw that may allow a malicious user to read or modify registry keys. The issue is triggered when System Attendant gives "Everyone" group privileges to the WinReg key. It is possible that the flaw may allow remote attackers to read or modify registry keys resulting in a loss of confidentiality and/or integrity.
Currently, there are no known workarounds or upgrades to correct this issue. However, Microsoft has released a patch to address this vulnerability.