Unstructured threats, which are technically unskilled or unsophisticated, can be external or internal. In external threats, an individual outside the organization may commit intrusions; with an internal threat, an individual inside the organization may exploit the system. Symantec Security Response. Glossary. [Online, July 15, 2004.] Symantec Security Response Website. http://securityresponse.symantec.com/avcenter/refa.html.