# CVE-2021-28815: Insecure Storage of Sensitive Information in myQNAPcloud Link

> Remote attackers can read sensitive information from QNAP NAS devices due to insecure storage in myQNAPcloud Link.

- **Severity:** Medium 6.0 (`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Jun 2021
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-x3wj-q2gh-27vc

## What is CVE-2021-28815?

CVE-2021-28815 is a medium-severity vulnerability in myQNAPcloud Link, published on 16 Jun 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Insecure storage of sensitive information has been reported to affect QNAP NAS running myQNAPcloud Link. If exploited, this vulnerability allows remote attackers to read sensitive information by accessing the unrestricted storage mechanism. This issue affects: QNAP Systems Inc. myQNAPcloud Link versions prior to 2.2.21 on QTS 4.5.3; versions prior to 2.2.21 on QuTS hero h4.5.2; versions prior to 2.2.21 on QuTScloud c4.5.4.

Weakness: CWE-922 (Insecure Storage of Sensitive Information)

## Which versions are affected by CVE-2021-28815?

It affects 1 product.


Products: Qnap Myqnapcloud Link.

## How do I fix CVE-2021-28815?

No fix has been published for CVE-2021-28815 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-28815 being exploited?

There is no known exploitation of CVE-2021-28815 in the wild and no public exploit code.

## Other vulnerabilities in myQNAPcloud Link

- [CVE-2024-32764](https://insights.sbomify.com/CVE-2024-32764/): myQNAPcloud Link (critical 9.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-28815 and fix it if it is affected.

What it is: CVE-2021-28815 is a medium-severity vulnerability in myQNAPcloud Link, published on 16 Jun 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-2021-28815 in the wild and no public exploit code.

Affected product: myQNAPcloud Link. 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-2021-28815/ (Markdown: https://insights.sbomify.com/CVE-2021-28815/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-28815
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-28815
- OSV: https://osv.dev/vulnerability/CVE-2021-28815

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-28815/
Summaries are generated and may contain mistakes; the official description above is the record.