CVE-2020-3321: Cisco Webex Network Recording Player

Low severity, CVSS 3.3. EPSS: 1.4% chance of exploitation in the next 30 days.

A vulnerability in Cisco Webex Network Recording Player and Cisco Webex Player for Microsoft Windows could allow an attacker to cause a process crash resulting in a Denial of service (DoS) condition for the player application on an affected system. The vulnerability exists due to insufficient validation of certain elements with a Webex recording stored in either the Advanced Recording Format (ARF) or the Webex Recording Format (WRF). An attacker could exploit this vulnerability by sending a user a malicious ARF or WRF file through a link or email attachment and persuading the user to open the file with the affected software on the local system. A successful exploit could allow the attacker to cause the Webex player application to crash when trying to view the malicious file.

Affected products

• Cisco Webex Network Recording Player: before 3.0 (fixed in 3.0); version 3.0 only; version 4.0 only
• Cisco Webex Player: before 3.0 (fixed in 3.0); version 3.0 only; version 4.0 only

Published 2020-06-03. Last modified 2026-06-17.