You can certainly try it on your own, but it likely won't be supported if you have/find issues. At some point AirWave will be upgraded to deploy CentOS 6.4, or later, but there's not a supported reason to update. All major security vulnerabilities are patched in/back ported as part of the normal upgrade process (like most all Linux-based OS servers). Loads of time is spent on QA, rapid and early OS upgrades are not tenable long-term.