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[LDAP] which is quite command out there in the real world!
Im assume you mean "common" not that I've ever used it...although I think Mail supports it.
From <
MacFixit>:
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This problem appears to only affect LDAP-bound systems, so if your system is not connected to a central authentication server (which has to be explicitly done by an IT administrator) then you should not be concerned with this problem. As a result, OS X systems purchased off the shelf will not be affected by this issue, so your Mac at home running OS X Lion will be safe from this vulnerability
Lots of fodder for Mac-haters, of course.