An ActiveX control (atucfobj.dll) that is used by the Cisco WebEx Meeting Manager contains a buffer overflow vulnerability that may result in a denial of service or remote code execution. The WebEx Meeting Manager is a client-side program that is provided by the Cisco WebEx meeting service. The Cisco WebEx meeting service automatically downloads, installs, and configures Meeting Manager the first time a user begins or joins a meeting.

Read more at: Cisco Security Advisories