Predictable TCP initial sequence numbers, DoS.
vulners.com/securityvulns/securityvulns:doc:3792
vulners.com/securityvulns/securityvulns:doc:3793
vulners.com/securityvulns/securityvulns:doc:3794
vulners.com/securityvulns/securityvulns:doc:3795