The Url_init function in utils/url.c in Netembryo 0.0.4, when used by LScube Feng, allows remote attackers to cause a denial of service (NULL dereference and daemon crash) via a malformed URI containing a "/:" sequence, as demonstrated by a "DESCRIBE /: RTSP/1.0" request.
http://www.vupen.com/english/advisories/2008/0012
http://www.securityfocus.com/archive/1/485574/100/0/threaded
http://securityreason.com/securityalert/3507