Bug ID 623243: Single-page application AJAX does not work properly with synchronous AJAX requests

Last Modified: Apr 01, 2021

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,,,,,,, 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,, 16.0.0,, 16.0.1,

Opened: Oct 18, 2016
Severity: 3-Major


When single-page application is enabled and a synchronous AJAX request is sent, ASM responses such as CAPTCHA response may not work as expected.


ASM end users may not be able to pass the CAPTCHA challenge and therefore not be able to access the application.


-- Single-page application is enabled in ASM. -- The single-page application sends a synchronous AJAX request that needs to be mitigated.


Modify the backend application to use an asynchronous AJAX request.

Fix Information


Behavior Change