Buffer overflow in gopher client for Microsoft Internet Explorer 5.1 through 6.0, Proxy Server 2.0, or ISA Server 2000 allows remote attackers to execute arbitrary code via a gopher:// URL that redirects the user to a real or simulated gopher server that sends a long response.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A98
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2002/ms02-027
http://www.securityfocus.com/bid/4930
http://www.pivx.com/workaround_fail.html
http://www.kb.cert.org/vuls/id/440275
http://www.iss.net/security_center/static/9247.php
http://online.securityfocus.com/archive/1/276848