CVE-2015-6420

CVE-2015-6420 describes a critical deserialization vulnerability affecting numerous Cisco products across various categories, including Collaboration, Endpoint Clients, Security Devices, and Routing/Switching. This flaw allows remote attackers to execute arbitrary commands by sending a specially crafted serialized Java object, leveraging a weakness in the Apache Commons Collections library. With a CVSS score of 9.8 (Critical), the vulnerability requires no user interaction or authentication and can lead to complete compromise of confidentiality, integrity, and availability. Despite its severity, there is no evidence of active exploitation, publicly available exploit code in common frameworks, or significant community discussion or media coverage.