CVE-2020-3573: Cisco Webex Network Recording Player and Cisco Webex Player Arbitrary Code Execution Vulnerabilities

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-11-06 · updated 2026-06-17
Weakness: CWE-119

Description

Multiple vulnerabilities in Cisco Webex Network Recording Player for Windows and Cisco Webex Player for Windows could allow an attacker to execute arbitrary code on an affected system. The vulnerabilities are due to insufficient validation of certain elements of a Webex recording that is stored in the Advanced Recording Format (ARF) or Webex Recording Format (WRF). An attacker could exploit these vulnerabilities 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 execute arbitrary code on the affected system with the privileges of the targeted user.

Affected products

Cisco Webex Meetings: from 40.6.0 before 40.6.11; from 40.7.0 before 40.8.0 — fixed in 40.6.11, 40.8.0
Cisco WebEx Meetings Server: 3.0, 3.0-maintenance_release2, 3.0-maintenance_release3, 3.0-maintenance_release3_service_pack_2, 3.0-maintenance_release3_service_pack_3, 4.0 (+2)

How to fix

Upgrade to a fixed version: Cisco Webex Meetings 40.6.11, 40.8.0. Check the vendor advisory for mitigations.

References

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