Vulnerability Bulletins

The BIG-IP system may respond with the NXDOMAIN status when it receives a DNS query of a certain type on a CNAME wide IP

   
Affected software F-Secure
 
The BIG-IP system may respond with the NXDOMAIN status when it receives a DNS query of a certain type on a CNAME wide IP. Security Advisory. ...

More info:

https://support.f5.com/csp/article/K23022557