# CVE-2020-3116: Cisco Webex Centers Denial of Service Vulnerability

> An attacker can cause a denial of service by tricking a user into opening a malicious UCF file in Cisco Webex Event Center.

- **Severity:** Medium 5.5 (`CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`)
- **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:** 23 Sep 2020
- **Updated:** 13 Nov 2024
- **Also known as:** GHSA-86c7-v7v4-whcp

## What is CVE-2020-3116?

CVE-2020-3116 is a medium-severity denial of service vulnerability in Cisco Webex Meetings Online, published on 23 Sep 2020. 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 way Cisco Webex applications process Universal Communications Format (UCF) files could allow an attacker to cause a denial of service (DoS) condition. The vulnerability is due to insufficient validation of UCF media files. An attacker could exploit this vulnerability by sending a user a malicious UCF file through a link or email attachment and persuading the user to open the file with the affected software on the local system. A successful exploit would cause the application to quit unexpectedly.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2020-3116?

It affects 2 products.


Products: Cisco Webex Meetings Online, Cisco Webex Meetings Server.

## How do I fix CVE-2020-3116?

No fix has been published for CVE-2020-3116 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-3116 being exploited?

There is no known exploitation of CVE-2020-3116 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Webex Meetings Online

- [CVE-2018-0287](https://insights.sbomify.com/CVE-2018-0287/): Code injection in Cisco WebEx Advanced Recording Format Player (high 8.8)
- [CVE-2019-1637](https://insights.sbomify.com/CVE-2019-1637/): Cisco Webex Network Recording Player Arbitrary Code Execution Vulnerabilities (high 7.8)
- [CVE-2019-1638](https://insights.sbomify.com/CVE-2019-1638/): Cisco Webex Network Recording Player Arbitrary Code Execution Vulnerabilities (high 7.8)
- [CVE-2019-1639](https://insights.sbomify.com/CVE-2019-1639/): Cisco Webex Network Recording Player Arbitrary Code Execution Vulnerabilities (high 7.8)
- [CVE-2019-1640](https://insights.sbomify.com/CVE-2019-1640/): Cisco Webex Network Recording Player Arbitrary Code Execution Vulnerabilities (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-3116 and fix it if it is affected.

What it is: CVE-2020-3116 is a medium-severity denial of service vulnerability in Cisco Webex Meetings Online, published on 23 Sep 2020. 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-2020-3116 in the wild and no public exploit code.

Affected product: Cisco Webex Meetings Online. 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-2020-3116/ (Markdown: https://insights.sbomify.com/CVE-2020-3116/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-3116
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-3116
- OSV: https://osv.dev/vulnerability/CVE-2020-3116

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-3116/
Summaries are generated and may contain mistakes; the official description above is the record.