# CVE-2021-20682: OS Command Injection in baserCMS

> Remote attackers with administrative privileges can execute arbitrary OS commands on baserCMS installations.

- **Severity:** High 7.2 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 26 Mar 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-g39q-f4rm-85x4

## What is CVE-2021-20682?

CVE-2021-20682 is a high-severity command injection vulnerability in Basercms Basercms, published on 26 Mar 2021. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

baserCMS versions prior to 4.4.5 allows a remote attacker with an administrative privilege to execute arbitrary OS commands via unspecified vectors.

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

## Which versions are affected by CVE-2021-20682?

2 open source packages ship an affected version, including baserproject/basercms. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `baserproject/basercms` | Packagist | All versions | 4.4.5 |
| `baserproject/basercms` | Packagist | All versions | 4.4.5 |

Products: Basercms Basercms.

## How do I fix CVE-2021-20682?

Upgrade baserproject/basercms to 4.4.5 or later.

## Is CVE-2021-20682 being exploited?

There is no known exploitation of CVE-2021-20682 in the wild and no public exploit code.

## Other vulnerabilities in Basercms Basercms

- [CVE-2023-25654](https://insights.sbomify.com/CVE-2023-25654/): baserCMS File Uploader Remote Code Execution (RCE) vulnerability (critical 9.8)
- [CVE-2023-25655](https://insights.sbomify.com/CVE-2023-25655/): baserCMS allows any file to be uploaded (critical 9.8)
- [CVE-2017-10842](https://insights.sbomify.com/CVE-2017-10842/): baserCMS SQL Injection vulnerability (critical 9.8)
- [CVE-2026-30880](https://insights.sbomify.com/CVE-2026-30880/): baserCMS: OS command injection vulnerability in installer (critical 9.2)
- [CVE-2026-21861](https://insights.sbomify.com/CVE-2026-21861/): baserCMS: OS Command Injection Leading to Remote Code Execution (RCE) (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-20682 and fix it if it is affected.

What it is: CVE-2021-20682 is a high-severity command injection vulnerability in Basercms Basercms, published on 26 Mar 2021. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-20682 in the wild and no public exploit code.

Affected packages and fixed versions:
- baserproject/basercms (Packagist): affected all versions; fixed in 4.4.5
- baserproject/basercms (Packagist): affected all versions; fixed in 4.4.5

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-2021-20682/ (Markdown: https://insights.sbomify.com/CVE-2021-20682/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-20682
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-20682
- OSV: https://osv.dev/vulnerability/CVE-2021-20682

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-20682/
Summaries are generated and may contain mistakes; the official description above is the record.