CVE-2000-1139: The installation of Microsoft Exchange 2000 before Rev.

Security readout for executives and security teams

Some early Microsoft Exchange 2000 installations created a user account with a known password. If that account remained present and usable, an attacker could use it to gain privileges. The issue is very old, but it matters if legacy Exchange 2000 systems or migrated accounts still exist. Exposure is most likely in organizations with legacy Microsoft Exchange 2000 installations made before Rev. A, or environments where related accounts survived migrations. Modern environments without Exchange 2000-era systems or accounts are unlikely to be affected based on the provided sources. Handle this as a legacy hygiene and privilege-risk check. It is not presented as currently exploited, but any surviving known-password account tied to Exchange 2000 would be unacceptable and should be investigated promptly. Mitigation focus: Check Microsoft MS00-088 for vendor-approved remediation details.; Identify any remaining Exchange 2000 before Rev. A deployments.; Review directory accounts created by historical Exchange 2000 installations..

Prepared

Jul 1, 2026, 09:50 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.