# CVE-2021-22879: Command injection in Nextcloud Desktop Client

> A malicious server can execute remote commands on the Nextcloud Desktop Client via URL injection, requiring user interaction.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 14 Apr 2021
- **Updated:** 3 Aug 2024
- **Also known as:** DEBIAN-CVE-2021-22879, GHSA-vrvw-x9cv-3j76, UBUNTU-CVE-2021-22879, openSUSE-SU-2021:0577-1, openSUSE-SU-2024:11088-1

## What is CVE-2021-22879?

CVE-2021-22879 is a high-severity command injection vulnerability in Fedoraproject Fedora, published on 14 Apr 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

Nextcloud Desktop Client prior to 3.1.3 is vulnerable to resource injection by way of missing validation of URLs, allowing a malicious server to execute remote commands. User interaction is needed for exploitation.

Weakness: CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), CWE-99 (Improper Control of Resource Identifiers)

## Which versions are affected by CVE-2021-22879?

It affects 2 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `nextcloud-desktop` | openSUSE:Leap 15.2 | All versions | 3.1.3-lp152.2.6.1 |

Products: Fedoraproject Fedora, Nextcloud Desktop.

## How do I fix CVE-2021-22879?

Upgrade to a fixed version.

## Is CVE-2021-22879 being exploited?

There is no known exploitation of CVE-2021-22879 in the wild and no public exploit code.

## Other vulnerabilities in Fedoraproject Fedora

- [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild)
- [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild)
- [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-22879 and fix it if it is affected.

What it is: CVE-2021-22879 is a high-severity command injection vulnerability in Fedoraproject Fedora, published on 14 Apr 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-2021-22879 in the wild and no public exploit code.

Affected product: Fedoraproject Fedora. 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-2021-22879/ (Markdown: https://insights.sbomify.com/CVE-2021-22879/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-22879
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-22879
- OSV: https://osv.dev/vulnerability/CVE-2021-22879

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-22879/
Summaries are generated and may contain mistakes; the official description above is the record.