Cisco TelePresence ISDN Gateway with software before 2.2(1.92) allows remote attackers to cause a denial of service (D-channel call outage) via a crafted Q.931 STATUS message, aka Bug ID CSCui50360.
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.