scripts/license.pl in Veritas NetBackup Appliance 2.6.0.x through 2.6.0.4, 2.6.1.x through 2.6.1.2, 2.7.x through 2.7.3, and 3.0.x allow remote attackers to execute arbitrary commands via shell metacharacters in the hostName parameter to appliancews/getLicense.