SSL Certificate - Signature Verification Failed Vulnerability

not that much information (sure a whole lot of text on the issue, but that is just copy pasting).

i assume a basic vulnerability scan (probably with Qualys) was performed against the management interface of your BIG-IP?

in that case it probably doesn't like that you are using the the self signed BIG-IP server certificate which isn't signed by a CA the scanning tool knows. so to resolve this you have to put a certificate signed by a known CA on the BIG-IP: http://support.f5.com/kb/en-us/solutions/public/14000/600/sol14620.html