Last Modified: Apr 28, 2025
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
10.2.4, 11.3.0, 11.4.0, 11.4.1
Fixed In:
11.5.0, 11.4.1 HF9
Opened: May 03, 2013 Severity: 4-Minor Related Article:
K15048
In 11.0.0 and 11.3.0, TMM silently drops the non-SYN packet without TCP RST if TCP 3WHS has not yet established. In 11.2.1, TMM sends the reset. In 10.2.3, TMM rejects non-SYN packet.
When this occurs, there is no RST for non-SYN packets.
TMM rejects non-SYN packet if TCP 3WHS has not yet established.
None.
TMM now correctly sends a RST packet when it receives a non-SYN TCP packet for which no connection has been established. In some versions, TMM would silently drop the packet.