Virtual servers in F5 BIG-IP systems 11.2.1 HF11 through HF15 11.4.1 HF4 through HF10 11.5.3 through 11.5.4 11.6.0 HF5 through HF7 and 12.0.0 when configured with a TCP profile allow remote attackers to cause a denial of service (Traffic Management Microkernel restart) via crafted network traffic.