# CVE-2020-3131: Cisco Webex Teams Adaptive Cards Denial of Service Vulnerability

> An authenticated attacker can crash the Cisco Webex Teams Windows client by sending malicious adaptive cards, causing a denial of service.

- **Severity:** Medium 6.5 (`CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Jan 2020
- **Updated:** 15 Nov 2024
- **Also known as:** GHSA-whhw-94p5-5pc4

## What is CVE-2020-3131?

CVE-2020-3131 is a medium-severity denial of service vulnerability in Cisco Webex Teams, published on 26 Jan 2020. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability in the Cisco Webex Teams client for Windows could allow an authenticated, remote attacker to cause the client to crash, resulting in a denial of service (DoS) condition. The attacker needs a valid developer account to exploit this vulnerability. The vulnerability is due to insufficient input validation when processing received adaptive cards. The attacker could exploit this vulnerability by sending an adaptive card with malicious content to an existing user of the Cisco Webex Teams client for Windows. A successful exploit could allow the attacker to cause the targeted user's client to crash continuously. This vulnerability was introduced in Cisco Webex Teams client for Windows Release 3.0.13131.

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2020-3131?

It affects 1 product.


Products: Cisco Webex Teams.

## How do I fix CVE-2020-3131?

No fix has been published for CVE-2020-3131 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-3131 being exploited?

There is no known exploitation of CVE-2020-3131 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Webex Teams

- [CVE-2025-20236](https://insights.sbomify.com/CVE-2025-20236/): Cisco Webex App Client-Side Remote Code Execution Vulnerability (high 8.8)
- [CVE-2018-0387](https://insights.sbomify.com/CVE-2018-0387/): Code injection in Cisco Webex Teams unknown (high 8.8)
- [CVE-2018-0436](https://insights.sbomify.com/CVE-2018-0436/): Cisco Webex Teams Information Disclosure and Modification Vulnerability (high 8.7)
- [CVE-2020-3535](https://insights.sbomify.com/CVE-2020-3535/): Cisco Webex Teams Client for Windows DLL Hijacking Vulnerability (high 7.8)
- [CVE-2019-1636](https://insights.sbomify.com/CVE-2019-1636/): Cisco Webex Teams URI Handler Insecure Library Loading Vulnerability (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-3131 and fix it if it is affected.

What it is: CVE-2020-3131 is a medium-severity denial of service vulnerability in Cisco Webex Teams, published on 26 Jan 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-3131 in the wild and no public exploit code.

Affected product: Cisco Webex Teams. 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-2020-3131/ (Markdown: https://insights.sbomify.com/CVE-2020-3131/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-3131
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-3131
- OSV: https://osv.dev/vulnerability/CVE-2020-3131

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-3131/
Summaries are generated and may contain mistakes; the official description above is the record.