# CVE-2020-3337: Cisco Umbrella Open Redirect Vulnerability

> An unauthenticated remote attacker can redirect users to malicious websites via crafted HTTP requests in Cisco Umbrella.

- **Severity:** Medium 4.7 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 18 Jun 2020
- **Updated:** 15 Nov 2024
- **Also known as:** GHSA-hf79-5ffr-p77w

## What is CVE-2020-3337?

CVE-2020-3337 is a medium-severity vulnerability in Cisco Umbrella, published on 18 Jun 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A vulnerability in the web server of Cisco Umbrella could allow an unauthenticated, remote attacker to redirect a user to an undesired web page. The vulnerability is due to improper input validation of the URL parameters in an HTTP request that is sent to an affected device. An attacker could exploit this vulnerability by sending a crafted HTTP request that could cause the web application to redirect the request to a specified malicious URL. A successful exploit could allow the attacker to redirect a user to a malicious website.

Weakness: CWE-601 (URL Redirection to Untrusted Site)

## Which versions are affected by CVE-2020-3337?

It affects 1 product.


Products: Cisco Umbrella.

## How do I fix CVE-2020-3337?

No fix has been published for CVE-2020-3337 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-3337 being exploited?

There is no known exploitation of CVE-2020-3337 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Umbrella

- [CVE-2018-0435](https://insights.sbomify.com/CVE-2018-0435/): Cisco Umbrella API Unauthorized Access Vulnerability (critical 9.1)
- [CVE-2019-1807](https://insights.sbomify.com/CVE-2019-1807/): Cisco Umbrella Dashboard Session Management Vulnerability (high 7.6)
- [CVE-2021-1474](https://insights.sbomify.com/CVE-2021-1474/): Cisco Umbrella Link and CSV Formula Injection Vulnerabilities (medium 6.5)
- [CVE-2021-1475](https://insights.sbomify.com/CVE-2021-1475/): Cisco Umbrella Link and CSV Formula Injection Vulnerabilities (medium 6.5)
- [CVE-2019-1792](https://insights.sbomify.com/CVE-2019-1792/): Cisco Umbrella Cross-Site Scripting Vulnerability (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-3337 and fix it if it is affected.

What it is: CVE-2020-3337 is a medium-severity vulnerability in Cisco Umbrella, published on 18 Jun 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2020-3337 in the wild and no public exploit code.

Affected product: Cisco Umbrella. 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-2020-3337/ (Markdown: https://insights.sbomify.com/CVE-2020-3337/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-3337
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-3337
- OSV: https://osv.dev/vulnerability/CVE-2020-3337

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-3337/
Summaries are generated and may contain mistakes; the official description above is the record.