# CVE-2021-30355: Privilege escalation in Amazon Kindle e-reader

> An attacker with framework user access can elevate privileges to root on Amazon Kindle e-readers, compromising device security.

- **Severity:** High 8.6 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/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:** 1 Sep 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-c9v4-rxrm-vmc5

## What is CVE-2021-30355?

CVE-2021-30355 is a high-severity vulnerability in Amazon Kindle e-reader, published on 1 Sep 2021. 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

Amazon Kindle e-reader prior to and including version 5.13.4 improperly manages privileges, allowing the framework user to elevate privileges to root.

Weakness: CWE-269 (Improper Privilege Management)

## Which versions are affected by CVE-2021-30355?

It affects 1 product.


Products: Amazon Kindle Firmware.

## How do I fix CVE-2021-30355?

No fix has been published for CVE-2021-30355 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-30355 being exploited?

There is no known exploitation of CVE-2021-30355 in the wild and no public exploit code.

## Other vulnerabilities in Amazon Kindle e-reader

- [CVE-2021-30354](https://insights.sbomify.com/CVE-2021-30354/): Integer overflow in Amazon Kindle e-reader (high 8.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-30355 and fix it if it is affected.

What it is: CVE-2021-30355 is a high-severity vulnerability in Amazon Kindle e-reader, published on 1 Sep 2021. 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-2021-30355 in the wild and no public exploit code.

Affected product: Amazon Kindle e-reader. 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-2021-30355/ (Markdown: https://insights.sbomify.com/CVE-2021-30355/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-30355
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-30355
- OSV: https://osv.dev/vulnerability/CVE-2021-30355

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-30355/
Summaries are generated and may contain mistakes; the official description above is the record.