Bug ID 781753: WebSocket traffic is transmitted with unknown opcodes

Last Modified: Nov 07, 2022

Bug Tracker

Affected Product:  See more info
BIG-IP LTM(all modules)

Known Affected Versions:
13.1.0,,,,,,,,, 13.1.1,,,,, 13.1.3,, 14.1.0,,,,,, 14.1.2,,,,,,,

Fixed In:

Opened: May 13, 2019
Severity: 3-Major


The BIG-IP system does not preserve WebSocket frames. Frame headers and payload may be reordered such that a header for a second frame may be sent out in the middle of a first frame's payload. Frame boundaries get skewed and payload gets interpreted as headers.


WebSocket frames are not preserved such that traffic appears to be garbage. -- If request logging is enabled, client frames may not be preserved. -- If response logging is enabled, server frames may not be preserved.


A request logging profile is configured on a WebSocket virtual server.


Remove the request logging profile.

Fix Information


Behavior Change