Microsoft SQL Server 6.0 through 2000, with SQL Authentication enabled, uses weak password encryption (XOR), which allows remote attackers to sniff and decrypt the password.

Microsoft SQL Server allows local users to obtain database passwords via the Data Transformation Service (DTS) package Properties dialog, aka the "DTS Password" vulnerability.

Microsoft SQL Server 6.5 uses weak encryption for the password for the SQLExecutiveCmdExec account and stores it in an accessible portion of the registry, which could allow local users to gain privileges by reading and decrypting the CmdExecAccount value.

The MSDTC (Microsoft Distributed Transaction Service Coordinator) for Microsoft Windows 2000, Microsoft IIS 5.0 and SQL Server 6.5 through SQL 2000 0.0 allows remote attackers to cause a denial of service (crash or hang) via malformed (random) input.