net-snmp -- Remote DoS

The Red Hat Security Response Team reports:

An array index error, leading to out-of heap-based buffer read flaw was
found in the way the net-snmp agent performed lookups in the
extension table. When certain MIB subtrees were handled by the
extend directive, a remote attacker (having read privileges to the
subntree) could use this flaw to cause a denial of service condition
via an SNMP GET request involving a non-existent extension table
entry.