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Not sure which version of ASM7WAF you are running. I haven't face such issue.
https://support.f5.com/csp/article/K52325602
Capture form above link
The default BIG-IP ASM configuration allows by default response codes 200 through 399 and 400, 401, 403, 404, 407, 417, 500 and 503. All other HTTP response codes are blocked by the BIG-IP ASM
- epaalxCirrus
I had to do a double take.., but no... in my v16.1.0, "403" is excluded from default (for Fundamental template).
Also, in your hyperlink's hyperlink K7922: Overview of BIG-IP ASM HTTP response code filtering, 403 is also excluded for "BIG-IP ASM 11.3.0 and later"
Link K7922: Overview of BIG-IP ASM HTTP response code filtering, is valid till v14.x as per details has updated.
Link https://support.f5.com/csp/article/K52325602 is valid till v15.x per details.
- epaalxCirrus
So, back to question - why 403 omitted (before and after v15)?
- epaalxCirrus
FYI... Original K52325602 was wrong - now corrected by removing 403 and 500.