Microsoft SQL 7.0 server allows a remote attacker to cause a denial of service via a malformed TDS packet.
https://docs.microsoft.com/en-us/security-updates/securitybulletins/1999/ms99-059
http://www.securityfocus.com/bid/817
http://support.microsoft.com/default.aspx?scid=kb%3B%5BLN%5D%3BQ248749