Microsoft Exchange Server 2000 System Attendant gives "Everyone" group privileges to the WinReg key, which could allow remote attackers to read or modify registry keys.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1022
https://exchange.xforce.ibmcloud.com/vulnerabilities/8092
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2002/ms02-003