# CVE-2021-43741: Path traversal in n/a

> An attacker can achieve remote code execution in CMSimple by manipulating file names in the configuration, requiring immediate patching.

- **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:** 13 Apr 2022
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-pf7h-2j4w-49wx

## What is CVE-2021-43741?

CVE-2021-43741 is a critical path traversal vulnerability in n/a, published on 13 Apr 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

CMSimple 5.4 is vulnerable to Directory Traversal. The vulnerability exists when a user changes the file name to malicious file on config.php leading to remote code execution.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2021-43741?

It affects 1 product.


Products: Cmsimple Cmsimple.

## How do I fix CVE-2021-43741?

No fix has been published for CVE-2021-43741 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-43741 being exploited?

There is no known exploitation of CVE-2021-43741 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2024-57548](https://insights.sbomify.com/CVE-2024-57548/): Missing authorization in n/a (critical 9.1)
- [CVE-2021-47734](https://insights.sbomify.com/CVE-2021-47734/): CMSimple 5.4 Authenticated Local File Inclusion Remote Code Execution (high 8.6)
- [CVE-2021-47735](https://insights.sbomify.com/CVE-2021-47735/): CMSimple 5.4 Authenticated Remote Code Execution via Template Editing (high 8.6)
- [CVE-2024-58280](https://insights.sbomify.com/CVE-2024-58280/): CMSimple 5.15 Remote Command Execution via Extensions Configuration (high 8.6)
- [CVE-2024-57546](https://insights.sbomify.com/CVE-2024-57546/): Information disclosure in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-43741 and fix it if it is affected.

What it is: CVE-2021-43741 is a critical path traversal vulnerability in n/a, published on 13 Apr 2022. 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-2021-43741 in the wild and no public exploit code.

Affected product: n/a. 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-2021-43741/ (Markdown: https://insights.sbomify.com/CVE-2021-43741/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-43741
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-43741
- OSV: https://osv.dev/vulnerability/CVE-2021-43741

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-43741/
Summaries are generated and may contain mistakes; the official description above is the record.