CVE-2025-20215 Cisco Webex Meeting Client Join Certificate Validation Vulnerability
An attacker on a local network could bypass certificate validation to join a meeting as another user, requiring Cisco Webex Meetings updates.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-20215?
CVE-2025-20215 is a medium-severity authentication bypass vulnerability in Cisco Webex Meetings, published on 6 Aug 2025. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-295
Which versions are affected by CVE-2025-20215?
How do I fix CVE-2025-20215?
No fix has been published for CVE-2025-20215 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2025-20215 being exploited?
There is no known exploitation of CVE-2025-20215 in the wild and no public exploit code.
Sources
Also known as GHSA-7pj3-g359-9mw7.