Cisco Webex Meetings Meeting-join certificate validation

Summaryinfo

A vulnerability classified as critical was found in Cisco Webex Meetings. This affects an unknown function of the component Meeting-join Handler. The manipulation results in certificate validation. This vulnerability is cataloged as CVE-2025-20215. The attack must originate from the local network. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Cisco Webex Meetings (version unknown). It has been classified as critical. Affected is an unknown function of the component Meeting-join Handler. The manipulation with an unknown input leads to a certificate validation vulnerability. CWE is classifying the issue as CWE-295. The product does not validate, or incorrectly validates, a certificate. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

A vulnerability in the meeting-join functionality of Cisco Webex Meetings could have allowed an unauthenticated, network-proximate attacker to complete a meeting-join process in place of an intended targeted user, provided the requisite conditions were satisfied. Cisco has addressed this vulnerability in the Cisco Webex Meetings service, and no customer action is needed. This vulnerability existed due to client certificate validation issues. Prior to this vulnerability being addressed, an attacker could have exploited this vulnerability by monitoring local wireless or adjacent networks for client-join requests and attempting to interrupt and complete the meeting-join flow as another user who was currently joining a meeting. To successfully exploit the vulnerability, an attacker would need the capability to position themselves in a local wireless or adjacent network, to monitor and intercept the targeted network traffic flows, and to satisfy timing requirements in order to interrupt the meeting-join flow and exploit the vulnerability. A successful exploit could have allowed the attacker to join the meeting as another user. However, the Cisco Product Security Incident Response Team (PSIRT) is not aware of any malicious use of the vulnerability that is described in this advisory.

The advisory is available at sec.cloudapps.cisco.com. This vulnerability is traded as CVE-2025-20215 since 10/10/2024. The exploitability is told to be difficult. The attack needs to approached within the local network. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/09/2025). This vulnerability is assigned to T1587.003 by the MITRE ATT&CK project.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2025-1733). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

• Cisco WebEx Meeting Center

Productinfo

Type

• Unified Communication Software

Vendor

• Cisco

Name

• Webex Meetings

License

• commercial

Website

• Vendor: https://www.cisco.com/

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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