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The memory-used figure returned by the hrStorageUsed entry in the Host Resources MIB is the sum of memory in use by all processes, plus the memory allocated by the OS to an internal cache (and therefore considered by the OS to be in use).
This cache can be quite large--in the hundreds of megabytes--and can represent nearly all unallocated memory not otherwise in use by other processes.
But the memory is still available, and the OS will release it from the cache to meet demand.
For a more reliable indication of available memory, poll the CNA SNMP agent for the following OID:
enterprises.routescience.rsMgmt.rsMedicMIB.rsMedicObjects.\ rsMedicCurrentMemUtil.0
.1.3.6.1.4.1.8638.2.1.1.9.0
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