Stack-based buffer overflow in res/res_format_attr_h264.c in Asterisk Open Source 11.x before 11.2.2 allows remote attackers to execute arbitrary code via a long sprop-parameter-sets H.264 media attribute in a SIP Session Description Protocol (SDP) header.
https://issues.asterisk.org/jira/browse/ASTERISK-20901
http://downloads.asterisk.org/pub/security/AST-2013-001.html