CVE-2020-3471: Cisco Webex Meetings and Cisco Webex Meetings Server Unauthorized Audio Information Exposure Vulnerability

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-11-18 · updated 2026-06-17
Weakness: CWE-20

Description

A vulnerability in Cisco Webex Meetings and Cisco Webex Meetings Server could allow an unauthenticated, remote attacker to maintain bidirectional audio despite being expelled from an active Webex session. The vulnerability is due to a synchronization issue between meeting and media services on a vulnerable Webex site. An attacker could exploit this vulnerability by sending crafted requests to a vulnerable Cisco Webex Meetings or Cisco Webex Meetings Server site. A successful exploit could allow the attacker to maintain the audio connection of a Webex session despite being expelled.

Affected products

Cisco WebEx Meetings Server: before 3.0; 3.0-maintenance_release2, 3.0-maintenance_release3, 4.0, 4.0-maintenance_release1, 4.0-maintenance_release2 — fixed in 3.0

How to fix

Upgrade to a fixed version: Cisco WebEx Meetings Server 3.0. Check the vendor advisory for mitigations.

References

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