CVE-2021-1311: Cisco Webex Meetings

Medium severity, CVSS 5.4. EPSS: 1.3% chance of exploitation in the next 30 days.

A vulnerability in the reclaim host role feature of Cisco Webex Meetings and Cisco Webex Meetings Server could allow an authenticated, remote attacker to take over the host role during a meeting. This vulnerability is due to a lack of protection against brute forcing of the host key. An attacker could exploit this vulnerability by sending crafted requests to a vulnerable Cisco Webex Meetings or Webex Meetings Server site. A successful exploit would require the attacker to have access to join a Webex meeting, including applicable meeting join links and passwords. A successful exploit could allow the attacker to acquire or take over the host role for a meeting.

Affected products

• Cisco Webex Meetings: before 40.12.0 (fixed in 40.12.0)
• Cisco Webex Meetings Server: before 3.0 (fixed in 3.0); version 3.0 only; version 4.0 only

Published 2021-01-13. Last modified 2026-06-17.