Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

smalex's avatar
smalex
Icon for Altostratus rankAltostratus
Jun 10, 2019

ASM- Bad HTTP version

We have implemented ASM last day and many requests are blocked stating: Bad HTTP version. Version is 1.1 but still its blocked. What might be the reason. Please Guide.
application delivery
ASM Advanced WAF
security
Kevin_Davies's avatar
Kevin_Davies
Icon for Nacreous rankNacreous
Jun 10, 2019

ASM will allow HTTP version 1.1. If you're getting bad version then you need to delve into the headers. If you can paste an example here then we can possibly tell you where things are wrong. After you paste, make sure to hit TAB as this will format it as code.