The MGCP implementation on the Cisco PGW 2200 Softswitch with software before 9.7(3)S11 allows remote attackers to cause a denial of service (device crash) via a malformed packet, aka Bug ID CSCsl39126.
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.