CVE-2025-20215
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-08-06

Last updated on: 2025-08-06

Assigner: Cisco Systems, Inc.

Description
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.
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Meta Information
Published
2025-08-06
Last Modified
2025-08-06
Generated
2026-05-07
AI Q&A
2025-08-06
EPSS Evaluated
2026-05-05
NVD
CVE-2025-20215
EUVD
EUVD-2025-23858
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
cisco webex_meetings *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-295 The product does not validate, or incorrectly validates, a certificate.
Attack-Flow Graph
AI Powered Q&A
How can this vulnerability impact me? :

If exploited, this vulnerability could allow an attacker to join a Webex meeting as another user without authentication, potentially gaining unauthorized access to meeting content and communications. This could lead to information disclosure or disruption of meetings. However, Cisco has addressed this issue and no customer action is needed.


What immediate steps should I take to mitigate this vulnerability?

Cisco has addressed this vulnerability in the Cisco Webex Meetings service, and no customer action is needed.


Can you explain this vulnerability to me?

This vulnerability in Cisco Webex Meetings' meeting-join functionality allowed an unauthenticated attacker, positioned on a local wireless or adjacent network, to intercept and complete the meeting-join process as another user by exploiting client certificate validation issues. The attacker needed to monitor network traffic and time their actions precisely to interrupt and take over the meeting-join flow.


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