# CVE-2021-20834: Missing authorization in Nike App for Android versions prior to 2.177 and Nike App for iOS versions prior to 2.177.1

> A remote attacker can trick users into accessing arbitrary websites via the Nike App's custom URL scheme due to improper authorization checks.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/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:** 13 Oct 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-v53j-jcc3-2p22

## What is CVE-2021-20834?

CVE-2021-20834 is a medium-severity missing authorization vulnerability in Nike, Inc. Nike App for Android versions prior to 2.177 and Nike App for iOS versions prior to 2.177.1, published on 13 Oct 2021. 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

Improper authorization in handler for custom URL scheme vulnerability in Nike App for Android versions prior to 2.177 and Nike App for iOS versions prior to 2.177.1 allows a remote attacker to lead a user to access an arbitrary website via the vulnerable App.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2021-20834?

It affects 1 product.


Products: Nike Nike.

## How do I fix CVE-2021-20834?

No fix has been published for CVE-2021-20834 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-20834 being exploited?

There is no known exploitation of CVE-2021-20834 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-20834 and fix it if it is affected.

What it is: CVE-2021-20834 is a medium-severity missing authorization vulnerability in Nike, Inc. Nike App for Android versions prior to 2.177 and Nike App for iOS versions prior to 2.177.1, published on 13 Oct 2021. 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-2021-20834 in the wild and no public exploit code.

Affected product: Nike, Inc. Nike App for Android versions prior to 2.177 and Nike App for iOS versions prior to 2.177.1. 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-2021-20834/ (Markdown: https://insights.sbomify.com/CVE-2021-20834/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-20834
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-20834
- OSV: https://osv.dev/vulnerability/CVE-2021-20834

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-20834/
Summaries are generated and may contain mistakes; the official description above is the record.