nettools.php in PHP Net Tools 2.7.1 allows remote attackers to execute arbitrary commands via shell metacharacters in the host parameter.
https://www.exploit-db.com/exploits/1695
https://exchange.xforce.ibmcloud.com/vulnerabilities/25941
http://www.vupen.com/english/advisories/2006/1420
http://www.securityfocus.com/bid/17601
http://www.attrition.org/pipermail/vim/2006-June/000839.html