TCP implementations that use random increments for initial sequence numbers (ISN) can allow remote attackers to perform session hijacking or disruption by injecting a flood of packets with a range of ISN values, one of which may match the expected ISN.
https://support.f5.com/csp/article/K19063943?utm_source=f5support&%3Butm_medium=RSS
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A4922
http://www.securitytracker.com/id/1033181
http://www.securityfocus.com/bid/2682
http://www.cert.org/advisories/CA-2001-09.html