Bug ID 865065: Bot Defense "User Agent Spoofing" Anomaly False Positive using Firefox on Fedora

Last Modified: Apr 20, 2022

Bug Tracker

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

Known Affected Versions:
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,, 14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3,, 14.1.4,,,,,,, 15.0.0, 15.0.1,,,,, 15.1.0,,,,,, 15.1.1, 15.1.2,, 15.1.3,, 15.1.4,, 15.1.5,

Fixed In:

Opened: Dec 26, 2019
Severity: 3-Major


Firefox browser, when running on Fedora Distribution, which accesses the Virtual Server which has Bot Defense profile could trigger a false positive of the "User Agent Spoofing" anomaly.


The client may get blocked.


-- Bot Defense profile is associated with the Virtual Server -- Client uses Firefox running on Fedora GNU/Linux


On the Bot Defense Profile, add an exception to "User Agent Spoofing" with the action set to Alarm or None.

Fix Information

Firefox browsers running on Fedora GNU/Linux no longer trigger the User Agent Spoofing anomaly.

Behavior Change