Following their plan to implement a twice-yearly patch cycle falling on the fourth Wednesday of March and September, today marks Cisco's biannual patch day for September 2009, with eleven security advisories released. Most of these advisories cover security vulnerabilities that affect devices running Cisco's Internetwork Operating System (IOS) software. IOS is the operating system that runs on most Cisco routers and switches. However, two of the advisories also cover vulnerabilities in Unified Communications Manager (UCM), which is Cisco's enterprise-level, IP telephony call-processing system.

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