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

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jyulkbox_48590's avatar
jyulkbox_48590
Icon for Nimbostratus rankNimbostratus
Jul 20, 2010

SIP bug? Comma-separated Via header

Hello,     I noticed that Big IP removes the Via header entirely if the Via header is a comma-separated line of multiple Via headers.     For example,     Via: SIP/2.0/UDP bigip.f...
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hoolio's avatar
hoolio
Icon for Cirrostratus rankCirrostratus
Jul 21, 2010
Hi Jong Yul,

 

 

This does look like it could be a bug. I would suggest opening a case with F5 Support to report the issue. They'll be able to test the issue with you. In the meantime, you could disable the 'Insert SIP VIA header' option and use an iRule with 'SIP::header insert' to manually insert this:

 

 

http://devcentral.f5.com/wiki/default.aspx/iRules/sip__header

 

 

Aaron