Buffer overflow in IIS 4.0 allows remote attackers to cause a denial of service via a malformed request for files with .HTR, .IDC, or .STM extensions.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A915
https://docs.microsoft.com/en-us/security-updates/securitybulletins/1999/ms99-019
http://www.eeye.com/html/Research/Advisories/AD06081999.html
http://www.ciac.org/ciac/bulletins/j-048.shtml
http://support.microsoft.com/default.aspx?scid=kb%3B%5BLN%5D%3BQ234905