Denial of service in IIS 4.0 via a flood of HTTP requests with malformed headers.
https://docs.microsoft.com/en-us/security-updates/securitybulletins/1999/ms99-029
http://www.securityfocus.com/bid/579
http://www.ciac.org/ciac/bulletins/j-058.shtml
http://support.microsoft.com/default.aspx?scid=kb%3B%5BLN%5D%3BQ238349