# CVE-2021-34348: Command Injection Vulnerability in QVR

> Remote attackers can execute arbitrary commands on QNAP QVR systems due to a command injection flaw, requiring an upgrade to the latest version.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Sep 2021
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-j4j5-p5q3-mfr7

## What is CVE-2021-34348?

CVE-2021-34348 is a critical command injection vulnerability in QNAP Systems Inc. QVR, published on 27 Sep 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A command injection vulnerability has been reported to affect QNAP device running QVR. If exploited, this vulnerability could allow remote attackers to run arbitrary commands. We have already fixed this vulnerability in the following versions of QVR: QVR 5.1.5 build 20210803 and later

Weakness: CWE-77 (Improper Neutralization of Special Elements used in a Command), CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2021-34348?

It affects 1 product.


Products: Qnap Qvr.

## How do I fix CVE-2021-34348?

No fix has been published for CVE-2021-34348 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-34348 being exploited?

There is no known exploitation of CVE-2021-34348 in the wild and no public exploit code.

## Other vulnerabilities in QNAP Systems Inc. QVR

- [CVE-2022-27588](https://insights.sbomify.com/CVE-2022-27588/): Vulnerability in QVR (critical 9.8)
- [CVE-2021-38685](https://insights.sbomify.com/CVE-2021-38685/): Command Injection Vulnerability in VioStor (critical 9.8)
- [CVE-2021-34351](https://insights.sbomify.com/CVE-2021-34351/): Command Injection Vulnerability in QVR (critical 9.8)
- [CVE-2025-52856](https://insights.sbomify.com/CVE-2025-52856/): VioStor (critical 9.3)
- [CVE-2021-38686](https://insights.sbomify.com/CVE-2021-38686/): Improper Authentication Vulnerability in VioStor (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-34348 and fix it if it is affected.

What it is: CVE-2021-34348 is a critical command injection vulnerability in QNAP Systems Inc. QVR, published on 27 Sep 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-34348 in the wild and no public exploit code.

Affected product: QNAP Systems Inc. QVR. 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-2021-34348/ (Markdown: https://insights.sbomify.com/CVE-2021-34348/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-34348
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-34348
- OSV: https://osv.dev/vulnerability/CVE-2021-34348

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-34348/
Summaries are generated and may contain mistakes; the official description above is the record.