FFmpeg 0.4.9, as used by MPlayer, allows context-dependent attackers to cause a denial of service (memory consumption) via unknown vectors, aka a "Tcp/udp memory leak."
https://exchange.xforce.ibmcloud.com/vulnerabilities/46326
http://www.openwall.com/lists/oss-security/2008/10/29/6
http://www.mandriva.com/security/advisories?name=MDVSA-2009:297
http://security.gentoo.org/glsa/glsa-200903-33.xml
http://secunia.com/advisories/34385
http://archives.neohapsis.com/archives/fulldisclosure/2008-09/0103.html