# CVE-2021-33497: Path Traversal in Dutchcoders transfer.sh

> An attacker can exploit a directory traversal vulnerability to delete arbitrary files on the server.

- **Severity:** Critical 9.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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:** Yes
- **Published:** 24 May 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-cf55-rq8x-hm6f, GO-2022-0925

## What is CVE-2021-33497?

CVE-2021-33497 is a critical path traversal vulnerability in n/a, published on 24 May 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Dutchcoders transfer.sh before 1.2.4 allows Directory Traversal for deleting files.

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

## Which versions are affected by CVE-2021-33497?

3 open source packages ship an affected version, including github.com/dutchcoders/transfer.sh. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/dutchcoders/transfer.sh` | Go | All versions | 1.2.4 |
| `github.com/dutchcoders/transfer.sh` | Go | All versions | 1.2.4 |
| `github.com/dutchcoders/transfer.sh` | Go | All versions | 1.2.4 |

Products: Dutchcoders Transfer.sh.

## How do I fix CVE-2021-33497?

Upgrade github.com/dutchcoders/transfer.sh to 1.2.4 or later.

## Is CVE-2021-33497 being exploited?

There is no known exploitation of CVE-2021-33497 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2022-40931](https://insights.sbomify.com/CVE-2022-40931/): Dutchoders transfer.sh contains an XSS vulnerability via malicious file upload (medium 6.1)
- [CVE-2021-33496](https://insights.sbomify.com/CVE-2021-33496/): Cross-site scripting in Dutchcoders transfer.sh (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-33497 and fix it if it is affected.

What it is: CVE-2021-33497 is a critical path traversal vulnerability in n/a, published on 24 May 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-2021-33497 in the wild and no public exploit code.

Affected packages and fixed versions:
- github.com/dutchcoders/transfer.sh (Go): affected all versions; fixed in 1.2.4
- github.com/dutchcoders/transfer.sh (Go): affected all versions; fixed in 1.2.4
- github.com/dutchcoders/transfer.sh (Go): affected all versions; fixed in 1.2.4

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-2021-33497/ (Markdown: https://insights.sbomify.com/CVE-2021-33497/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-33497
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-33497
- OSV: https://osv.dev/vulnerability/CVE-2021-33497

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-33497/
Summaries are generated and may contain mistakes; the official description above is the record.