CVE-2021-40122: Cisco Meeting Server

High severity, CVSS 7.5. EPSS: 1.2% chance of exploitation in the next 30 days.

A vulnerability in an API of the Call Bridge feature of Cisco Meeting Server could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. This vulnerability is due to improper handling of large series of message requests. An attacker could exploit this vulnerability by sending a series of messages to the vulnerable API. A successful exploit could allow the attacker to cause the affected device to reload, dropping all ongoing calls and resulting in a DoS condition.

Affected products

• Cisco Meeting Server: up to and including 3.1; from 3.2, before 3.2.3 (fixed in 3.2.3)

Published 2021-10-21. Last modified 2026-06-17.