The vulnerability is caused due to the usage of vulnerable collection of libraries that are part of DCMTK Toolkit, specifically the parser for the DICOM Upper Layer Protocol or DUL.

Buffer overflow/underflow can be triggered when sending and processing wrong length of ACSE data structure received over the network by the DICOM Store-SCP service.
Cisco WebEx extension for Chrome includes an OS command injection vulnerability. This module serves a specially crafted web page using HTTPS. If a vulnerable version of the extension is installed and the web browser connects to Impact's web server, this module will deploys an OS agent.