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

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Eric_Seidman_10's avatar
Eric_Seidman_10
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Jul 03, 2007

Dealing with null bytes in STREAM replacement

Hello,   Question from a new iRule developer.     I am trying to replace a string containing null bytes with another string containing null bytes using a iRule. Specifically, I am trying to ...
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Eric_Seidman_10's avatar
Eric_Seidman_10
Icon for Nimbostratus rankNimbostratus
Jul 12, 2007
Hello,

 

After consulting with F5 support, I am told that using a STREAM profile to match anything involving a NULL byte is not possible.

 

 

However, I was told the following:

 

 

"It may be possible to reference the hex data and replace it with the TCP::payload command, but I am not positive that this is possible. The DevCentral community is the best resource for this type of information."

 

 

Does anyone know if this is possible?

 

 

Thanks,

 

eric