Bug ID 604133: Ramcache may leave the HTTP Cookie Cache in an inconsistent state

Last Modified: Sep 13, 2023

Affected Product(s):
BIG-IP LTM(all modules)

Known Affected Versions:
12.0.0, 12.0.0 HF1, 12.1.0 HF1, 12.0.0 HF2, 12.1.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2, 12.1.0, 12.1.1

Fixed In:
13.0.0, 12.1.2

Opened: Jul 11, 2016

Severity: 3-Major


Ramcache may re-use internal HTTP data without clearing the cookie cache. If other filters later inspect that cache they may read corrupted cookie information, or cause a TMM crash.


The modifications of the corrupt cookie cache may cause HTTP headers to be malformed. Inspecting the cookie cache may cause the TMM to crash with an assert. Traffic disrupted while tmm restarts.


Ramcache + another filter or iRule inspecting/modifying cookies in a Ramcache response.



Fix Information

Ramcache clears the HTTP cookie cache in its responses.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips