Security issues always boil down to two major areas of containment; Operating System and Application.
Since, as was mentioned by one of my colleagues, we cover those specific areas, adding a 'Security' forum would be redundant. There is the additional risk that someone would take it upon themselves to abuse that forum, or at least attempt to circumvent the conceptual idea for the foundation of such a forum through misuse and improper subject matter discussion.
While that opportunity exists for ANY specific forum, a labeled 'Security' forum tends to bring out the slugs who merely want to show off some imagined 733t H@x0r 5kilz.
Those are the sorts of individuals we do not wish to engage in topical and meaningful discussion.
If a system administrator bears the burden of security and can relate said concern as a query, it would serve them better to understand the issue as it relates to either OS or App. (Not to mention the interaction of the two, which brings me to my next point.)
Segueway
At times, yes there will be convergence, but duplication of queries which each would not follow the same line of thought tend to branch and divide -- so much better would be to follow a concept to conclusion, only to realize the next path travelled a different road and take that data you have gathered unto that to help clarify the problem.
Are there security groups within large organizations, yes. They often live in a world more of bits, than bytes. Having done security for the US Government, I am able to attest to the nature of the security analyst.
If that analogy is difficult to follow, understand that by the time you have an exploit (or more important to the sysad/app manager) a bug fix, the security engineer has already completed his function.
If your intent is to discuss the safety and security of systems you have relating directly to exploits that exist in the wild, then your concern is with the fixes, not with the bugs themselves.
I know ATNO, I am waxing rhapsodic again.
Cheers.
"It's always a long day, 86,400 won't fit into a short."