Bug ID 952509: Cross origin AJAX requests are blocked in case there is no Origin header

Last Modified: May 07, 2021

Bug Tracker

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

Known Affected Versions:
15.1.0,,,,,, 15.1.1, 15.1.2,, 15.1.3

Opened: Oct 07, 2020
Severity: 4-Minor


When using Single Page Application, if a CORS request is sent without an Origin, the "Access-Control-Allowed-Origin" header is not set and the request is blocked.


Request is blocked.


-- ASM policy / DoS (with application) profile / Bot Defense Profile are attached to VS, with a "Single Page Application" flag enabled. -- Client is using dosl7.allowed_origin option -- CORS Request is sent without an Origin header.


Use an iRule to add the Origin header according to the domain in the Referrer header.

Fix Information


Behavior Change