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

Forum Discussion

F5beginner_3849's avatar
F5beginner_3849
Icon for Nimbostratus rankNimbostratus
Apr 16, 2019

Bad certificate assigned to Host

Hello,   I have a virtual server, which have more certificates. I´m using SNI to differentiate URL hosts.   Let´s say I have two domains: exmaple.com and test.com and Certificates have defined...
application delivery
big-ip
LTM
Andy_McGrath's avatar
Andy_McGrath
Icon for Cumulonimbus rankCumulonimbus
Apr 16, 2019

Your certificate SNIs need to match the FQDN so if your certificate allows for 

test.com
and 
example.com
then it will not allow 
something.test.com
or 
mail.example.com
.

Best option is to update the certificate to include all the FQDNs you need client to access your service.