Published: 06 July 2011

chan_iax2.c in the IAX2 channel driver in Asterisk Open Source 1.4.x before, 1.6.2.x before, and 1.8.x before, and Asterisk Business Edition C.3 before C.3.7.3, accesses a memory address contained in an option control frame, which allows remote attackers to cause a denial of service (daemon crash) or possibly have unspecified other impact via a crafted frame.