Buffer overflow in the fetchsms function in the SMS handling module (libsms_getsms.c) in OpenSER 1.2.0 and earlier allows remote attackers to cause a denial of service (crash) via a crafted SMS message, triggering memory corruption when the "beginning" buffer is copied to the third (pdu) argument.
https://exchange.xforce.ibmcloud.com/vulnerabilities/31137
http://www.securityfocus.com/bid/21800
http://www.securityfocus.com/archive/1/455415/100/0/threaded
http://archives.neohapsis.com/archives/bugtraq/2007-01/0093.html