Cisco Systems has released new security patches for several versions of Unified Communications Manager (UCM) to address vulnerabilities that could allow remote attackers to execute arbitrary commands, modify system data, or disrupt services. The UCM is the call processing component of Cisco's IP Telephony solution. It connects to IP (Internet Protocol) phones, media processing devices, VoIP gateways, and multimedia applications and provides services such as session management, voice, video, messaging, mobility, and web conferencing.