Bug ID 911853: Stream filter chunk-size limits filter to a single match per ingress buffer

Last Modified: Jul 23, 2021

Bug Tracker

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

Known Affected Versions:
16.0.0,, 16.0.1,,

Fixed In:

Opened: May 26, 2020
Severity: 4-Minor


The chunk-size profile setting of the stream filter limits memory by capping the match string allocated from an ingress buffer to <chunksize> bytes. This implicitly limits the maximum size of the match, potentially resulting in missed matches beyond chunk-size within the same ingress buffer. For more information, see: https://support.f5.com/csp/article/K39394712


Potential matches beyond the configured chunk-size will be sent unmodified by the stream filter, potentially resulting in missed matches.


A stream filter is configured with the chunk-size parameter set and ingress data arrives which contains matches beyond the configured chunk-size in the buffer.



Fix Information

The stream filter can now successfully find and replace matches beyond chunk-size within a single ingress buffer.

Behavior Change