Bug ID 874153: Bot Defense 'Web RootKit' Anomaly False Positive using Seznam.cz Browser on iOS

Last Modified: Jan 20, 2023

Bug Tracker

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

Known Affected Versions:
14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3,, 14.1.4,,,,,,, 14.1.5,,,

Fixed In:

Opened: Jan 29, 2020
Severity: 3-Major


When using Bot Defense profile with browser verification, and sending a request using Seznam.cz Browser - 'Web RootKit' anomaly is detected and the client is blocked.


The client is blocked.


-- Bot Defense profile is used, with a 'Verify After Access' or 'Verify Before Access' Browser Validation. -- Request is sent using Seznam.cz browser on iOS.


Change the bigDB variable for minimum web rootkit allowed to a higher value. This allows all web rootkited browsers. tmsh modify sys db botdefense.min_rootkit_functions value 100

Fix Information

Disable Web Rootkit tests for Seznam.cz browser on iOS. Note: Fix is valid only when not using Device ID Collection.

Behavior Change