CVE-2000-1139
The installation of Microsoft Exchange 2000 before Rev. A creates a user account with a known password, which could allow attackers to gain privileges, aka the "Exchange User Account" vulnerability.
Date published : 2001-01-22
http://www.securityfocus.com/bid/1958
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2000/ms00-088