The SIP Proxy (SIPD) service in Cisco Unified Presence before 6.0(3) allows remote attackers to cause a denial of service (core dump and service interruption) via a TCP port scan, aka Bug ID CSCsj64533.
Improper Input Validation The product receives input or data, but it does
not validate or incorrectly validates that the input has the
properties that are required to process the data safely and
correctly.