Axis Network Camera 2.40 and earlier, and Video Server 3.12 and earlier, allows remote attackers to execute arbitrary commands via accent (`) and possibly other shell metacharacters in the query string to virtualinput.cgi.
https://exchange.xforce.ibmcloud.com/vulnerabilities/17076
http://www.securityfocus.com/bid/11011
http://secunia.com/advisories/12353
http://archives.neohapsis.com/archives/fulldisclosure/2004-08/1282.html