# 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.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N`)
- **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 available:** No
- **Published:** 6 Aug 2025
- **Updated:** 6 Aug 2025
- **Also known as:** GHSA-7pj3-g359-9mw7

## 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 (Improper Certificate Validation)

## 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.

## Is CVE-2025-20215 being exploited?

There is no known exploitation of CVE-2025-20215 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-20215 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2025-20215 in the wild and no public exploit code.

Affected product: Cisco Webex Meetings. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-20215/ (Markdown: https://insights.sbomify.com/CVE-2025-20215/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-20215
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-20215
- OSV: https://osv.dev/vulnerability/CVE-2025-20215

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From sbomify Insights: https://insights.sbomify.com/CVE-2025-20215/
Summaries are generated and may contain mistakes; the official description above is the record.