Bug ID 560889: Some User-Agent strings are parsed incorrectly resulting in a wrong browser family

Last Modified: Apr 20, 2022

Bug Tracker

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

Known Affected Versions:
12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2, 12.1.2, 12.1.2 HF1, 12.1.2 HF2, 12.1.3,,,,,,,, 12.1.4,, 12.1.5,,,, 12.1.6, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 13.1.0,,,,,,,,, 13.1.1,,,,, 13.1.3,,,,,,, 13.1.4,, 13.1.5, 14.0.0,,,,,, 14.0.1,

Opened: Dec 03, 2015
Severity: 3-Major


When AM is configured for image optimization it may require to determine browser type to allow browser-specific optimizations. Incorrect browser family may result in using of an inapplicable optimization. For example, if Internet Explorer is recognized as Chrome, it may be served with an optimized image in WEBP format instead of JPEG.


The client's browser may not render the page correctly.


An optimization is configured in AM policy requiring a browser specific optimization, e.g. image optimization.


Disable the appropriate optimization.

Fix Information


Behavior Change