Download 6.5.4 patches for your Solaris Master, Client patch as well as Java an Vault patch. Also download appropriate Server patch software if you have other Unix media servers. The Client patch contain all flavours of Unix clients.
If you have database agents for Unix clients, download the appropriate patch for each agent. If you have Windows media servers and clients, download the appropriate patch for 32-bit and/or x64 servers and clients.
Find links to all patch downloads here: http://seer.entsupport.symantec.com/docs/326270.htm
Start with the master server:
Do a catalog backup as a precaution.
Copy and extract these patches in a temp directory:
NB_6.5.4.solaris_326381.tar
NB_CLT_6.5.4_326396.tar
NB_JAV_6.5.4_326406.tar
NB_VLT_6.5.4_326438.tar
Read the README where you download the Solaris server patch for patch order installation.
Run NB_update.install and select patches one-by-one.