The web mail functionality in Usermin 1.x and Webmin 1.x allows remote attackers to execute arbitrary commands via shell metacharacters in an e-mail message.
https://exchange.xforce.ibmcloud.com/vulnerabilities/17293
https://euvd.enisa.europa.eu/vulnerability/EUVD-2004-1462
http://www.securityfocus.com/bid/11122
http://www.lac.co.jp/security/csl/intelligence/SNSadvisory_e/77_e.html