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

Forum Discussion

Peter_Lowdon's avatar
Peter_Lowdon
Icon for Altocumulus rankAltocumulus
Aug 11, 2022

HTTP::payload collection mangling UTF-8 characters

hi f5'ers, The HTTP::payload command doesn' seem to ba able to handle UTF-8 encoded characters.  When I capture the HTTP payload into a variable and then manipulate it and update the HTTP payload be...
application delivery
LTM HTTP::payload UTF-8
Dario_Garrido's avatar
Dario_Garrido
Icon for Noctilucent rankNoctilucent
Aug 13, 2022

Hello Peter, 

Have you tried this?

"Note that the argument will be interpreted as a byte array. If it is actually a UTF-8 string with multibyte characters, the output will not be what you expect. In order to prepare a UTF-8 string for use as input to HTTP::payload replace, you should first run ‘binary scan c* throwawayvariable’."

REF - https://clouddocs.f5.com/api/irules/HTTP__payload.html

This could also help:

https://support.f5.com/csp/article/K22406348