CVE-2020-3440: Cisco Webex Meetings

Medium severity, CVSS 6.5. EPSS: 2.6% chance of exploitation in the next 30 days.

A vulnerability in Cisco Webex Meetings Desktop App for Windows could allow an unauthenticated, remote attacker to overwrite arbitrary files on an end-user system. The vulnerability is due to improper validation of URL parameters that are sent from a website to the affected application. An attacker could exploit this vulnerability by persuading a user to follow a URL to a website that is designed to submit crafted input to the affected application. A successful exploit could allow the attacker to overwrite arbitrary files on the affected system, possibly corrupting or deleting critical system files.

Affected products

• Cisco Webex Meetings: before 40.8 (fixed in 40.8)

Published 2020-08-26. Last modified 2026-06-17.