# CVE-2021-21532: Missing authorization in Wyse Proprietary OS (ThinOS)

> Attackers can redirect ThinOS clients to malicious servers to modify device configurations or certificates due to improper validation.

- **Severity:** Medium 5.0 (`CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 2 Apr 2021
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-3gp6-mhp9-qvmh

## What is CVE-2021-21532?

CVE-2021-21532 is a medium-severity missing authorization vulnerability in Dell Wyse Proprietary OS (ThinOS), published on 2 Apr 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Dell Wyse ThinOS 8.6 MR9 contains remediation for an improper management server validation vulnerability that could be potentially exploited to redirect a client to an attacker-controlled management server, thus allowing the attacker to change the device configuration or certificate file.

Weakness: CWE-20 (Improper Input Validation), CWE-16

## Which versions are affected by CVE-2021-21532?

It affects 1 product.


Products: Dell Wyse Thinos.

## How do I fix CVE-2021-21532?

No fix has been published for CVE-2021-21532 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-21532 being exploited?

There is no known exploitation of CVE-2021-21532 in the wild and no public exploit code.

## Other vulnerabilities in Dell Wyse Proprietary OS (ThinOS)

- [CVE-2020-29491](https://insights.sbomify.com/CVE-2020-29491/): Misconfiguration in Wyse Proprietary OS (ThinOS) (critical 10.0)
- [CVE-2020-29492](https://insights.sbomify.com/CVE-2020-29492/): Misconfiguration in Wyse Proprietary OS (ThinOS) (critical 10.0)
- [CVE-2024-42427](https://insights.sbomify.com/CVE-2024-42427/): Command injection in Wyse Proprietary OS (Modern ThinOS) (high 7.6)
- [CVE-2021-21597](https://insights.sbomify.com/CVE-2021-21597/): Information disclosure in Wyse ThinOS (high 7.2)
- [CVE-2022-34402](https://insights.sbomify.com/CVE-2022-34402/): Denial of service in Wyse Proprietary OS (Modern ThinOS) (medium 6.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-21532 and fix it if it is affected.

What it is: CVE-2021-21532 is a medium-severity missing authorization vulnerability in Dell Wyse Proprietary OS (ThinOS), published on 2 Apr 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-21532 in the wild and no public exploit code.

Affected product: Dell Wyse Proprietary OS (ThinOS). 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-2021-21532/ (Markdown: https://insights.sbomify.com/CVE-2021-21532/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-21532
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-21532
- OSV: https://osv.dev/vulnerability/CVE-2021-21532

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-21532/
Summaries are generated and may contain mistakes; the official description above is the record.