Microsoft ISA Server 2000 allows remote attackers to connect to services utilizing the NetBIOS protocol via a NetBIOS connection with an ISA Server that uses the NetBIOS (all) predefined packet filter.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A468
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2005/ms05-034
http://www.securityfocus.com/bid/13954
http://www.kb.cert.org/vuls/id/367077