SIPD in Cisco Unified Presence 6.x before 6.0(7) and 7.x before 7.0(8) allows remote attackers to cause a denial of service (stack memory corruption and process failure) via a malformed SIP message, aka Bug ID CSCtd14474.
http://www.vupen.com/english/advisories/2010/2186
http://www.cisco.com/en/US/products/products_security_advisory09186a0080b43909.shtml