EMC Data Domain OS (DD OS) 5.4 all versions, EMC Data Domain OS (DD OS) 5.5 family all versions prior to 5.5.5.0, EMC Data Domain OS (DD OS) 5.6 family all versions prior to 5.6.2.0, EMC Data Domain OS (DD OS) 5.7 family all versions prior to 5.7.2.10 has a command injection vulnerability that could potentially be exploited by malicious users to compromise the affected system.