CVE-2020-3128: Cisco Webex Meetings

High severity, CVSS 7.8. EPSS: 1.9% chance of exploitation in the next 30 days.

Multiple vulnerabilities in Cisco Webex Network Recording Player for Microsoft Windows and Cisco Webex Player for Microsoft Windows could allow an attacker to execute arbitrary code on an affected system. The vulnerabilities are due to insufficient validation of certain elements within a Webex recording that is stored in either the Advanced Recording Format (ARF) or the Webex Recording Format (WRF). An attacker could exploit these vulnerabilities by sending a malicious ARF or WRF file to a user through a link or email attachment and persuading the user to open the file on the local system. A successful exploit could allow the attacker to execute arbitrary code on the affected system with the privileges of the targeted user.

Affected products

• Cisco Webex Meetings: from 39.5, before 39.5.17 (fixed in 39.5.17)
• Cisco Webex Meetings Online: before 1.3.49 (fixed in 1.3.49)
• Cisco Webex Meetings Server: before 3.0 (fixed in 3.0); version 3.0 only; version 4.0 only
• Cisco Webex Network Recording Player: before 39.5.17 (fixed in 39.5.17); before 39.11.0 (fixed in 39.11.0)

Published 2020-03-04. Last modified 2026-06-17.