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

Forum Discussion

Blue_whale's avatar
Blue_whale
Icon for Cirrocumulus rankCirrocumulus
Mar 24, 2026

[ASM] : "Request length exceeds defined buffer size " - How to increase the limit ?

Hi Experts ,    WAF is rejecting the request because it exceeds the maximum allowed request size (10MB)   Requested URL : [HTTPS] /stock.option Host : trade-it.ifund.com     Detected Request ...
application delivery
ASCapi's avatar
ASCapi
Icon for Cirrus rankCirrus
Mar 27, 2026

Hello Blue_whale​  

Via system variables you could do it. 
In my case environment I had to increase it.

-ASCapi

ASCapi's avatar
ASCapi
Icon for Cirrus rankCirrus
Mar 27, 2026

Yet I can not say if it recommended to change de default value. Of course if you're sure that is false-positive so it takes sense

  • Daniel_Wolf's avatar
    Daniel_Wolf
    Icon for MVP rankMVP
    Mar 27, 2026

    Good point ASCapi​. From my experience I can say that the default value is low. However I wouldn't give any recommendation for a one-size-fits-all value to apply in any environment.