This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit Reader 220.127.116.1155. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the author attribute of Circle Annotation objects. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute code under the context of the current process. Was ZDI-CAN-5023.