Bug ID 693775: Proactive Bot Defense sends CAPTCHA to the Safari 5-6.2

Last Modified: Oct 06, 2020

Bug Tracker

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

Fixed In:

Opened: Nov 09, 2017
Severity: 4-Minor


Safari 5-6.2 gets CAPTCHA when Proactive Bot Defense si enabled and a request arrives without valid Proactive Bot Defense cookie.


Legitimate users of Safari 5-6.2 are challenged with captcha.


1. ASM or DoS Provisioned. 2. DoS Application profile assigned to a virtual server. 3. Proactive Bot Defense and Block suspicious browsers sections are enabled in the DoS Application profile configuration.


Disable Proactive Bot Defense or change browser_legit_min_score_drop sys db to be higher value. list sys db dosl7.browser_legit_min_score_drop sys db dosl7.browser_legit_min_score_drop { value "120" }

Fix Information

CanIUse db has been updated to support Safari 5-6.2

Behavior Change