# CVE-2021-3707: Missing authorization in DSL-2750U

> Unauthenticated local attackers can modify router configuration and execute OS commands on D-Link DSL-2750U devices.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Aug 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-q2w4-9m66-g5ff

## What is CVE-2021-3707?

CVE-2021-3707 is a medium-severity missing authorization vulnerability in D-Link DSL-2750U, published on 16 Aug 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

D-Link router DSL-2750U with firmware vME1.16 or prior versions is vulnerable to unauthorized configuration modification. An unauthenticated attacker on the local network may exploit this, with CVE-2021-3708, to execute any OS commands on the vulnerable device.

Weakness: CWE-15 (External Control of System or Configuration Setting)

## Which versions are affected by CVE-2021-3707?

It affects 1 product.


Products: Dlink Dsl-2750u Firmware.

## How do I fix CVE-2021-3707?

No fix has been published for CVE-2021-3707 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-3707 being exploited?

There is no known exploitation of CVE-2021-3707 in the wild and no public exploit code.

Public exploit code:

- CVE-2021-3707 , CVE-2021-3708 (github_poc): https://github.com/HadiMed/DSL-2750U-Full-chain

## Other vulnerabilities in D-Link DSL-2750U

- [CVE-2019-1010155](https://insights.sbomify.com/CVE-2019-1010155/): Auth bypass in DSL-2750U (critical 9.1)
- [CVE-2021-3708](https://insights.sbomify.com/CVE-2021-3708/): Command injection in DSL-2750U (high 7.8)
- [CVE-2020-13150](https://insights.sbomify.com/CVE-2020-13150/): Auth bypass in n/a (high 7.8)
- [CVE-2024-9792](https://insights.sbomify.com/CVE-2024-9792/): D-Link DSL-2750U Port Forwarding Page cross site scripting (medium 5.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-3707 and fix it if it is affected.

What it is: CVE-2021-3707 is a medium-severity missing authorization vulnerability in D-Link DSL-2750U, published on 16 Aug 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-3707 in the wild and no public exploit code.

Affected product: D-Link DSL-2750U. 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-2021-3707/ (Markdown: https://insights.sbomify.com/CVE-2021-3707/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-3707
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-3707
- OSV: https://osv.dev/vulnerability/CVE-2021-3707

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-3707/
Summaries are generated and may contain mistakes; the official description above is the record.