CVE-2020-3321: Cisco Webex Network Recording Player and Cisco Webex Player Denial of Service Vulnerability

Severity: low (CVSS 3.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-06-03 · updated 2026-06-17
Weakness: CWE-20

Description

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; 3.0, 3.0-maintenance_release1, 3.0-maintenance_release2, 4.0, 4.0-maintenance_release1, 4.0-maintenance_release2 — fixed in 3.0
Cisco Webex Player: before 3.0; 3.0, 3.0-maintenance_release1, 3.0-maintenance_release2, 4.0, 4.0-maintenance_release1, 4.0-maintenance_release2 — fixed in 3.0

How to fix

Upgrade to a fixed version: Cisco Webex Network Recording Player 3.0; Cisco Webex Player 3.0. Check the vendor advisory for mitigations.

References

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