# CVE-2024-4242: Tenda W9 wifiSSIDget formwrlSSIDget stack-based overflow

> Remote attackers can trigger a stack-based buffer overflow in the Tenda W9 router via the wifiSSIDget endpoint, potentially leading to code execution or denial of service.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Apr 2024
- **Updated:** 1 Aug 2024
- **Also known as:** GHSA-7rww-65p2-qxxm

## What is CVE-2024-4242?

CVE-2024-4242 is a high-severity memory corruption vulnerability in Tenda W9, published on 26 Apr 2024. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability was found in Tenda W9 1.0.0.7(4456). It has been rated as critical. This issue affects the function formwrlSSIDget of the file /goform/wifiSSIDget. The manipulation of the argument ssidIndex leads to stack-based buffer overflow. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. The identifier VDB-262133 was assigned to this vulnerability. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-787 (Out-of-bounds Write), CWE-121 (Stack-based Buffer Overflow)

## Which versions are affected by CVE-2024-4242?

It affects 1 product.


Products: Tenda W9 Firmware.

## How do I fix CVE-2024-4242?

No fix has been published for CVE-2024-4242 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-4242 being exploited?

There is no known exploitation of CVE-2024-4242 in the wild and no public exploit code.

## Other vulnerabilities in Tenda W9

- [CVE-2023-51097](https://insights.sbomify.com/CVE-2023-51097/): Memory corruption in n/a (critical 9.8)
- [CVE-2023-51098](https://insights.sbomify.com/CVE-2023-51098/): Command injection in n/a (critical 9.8)
- [CVE-2023-51099](https://insights.sbomify.com/CVE-2023-51099/): Command injection in n/a (critical 9.8)
- [CVE-2023-51100](https://insights.sbomify.com/CVE-2023-51100/): Command injection in n/a (critical 9.8)
- [CVE-2023-51101](https://insights.sbomify.com/CVE-2023-51101/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-4242 and fix it if it is affected.

What it is: CVE-2024-4242 is a high-severity memory corruption vulnerability in Tenda W9, published on 26 Apr 2024. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2024-4242 in the wild and no public exploit code.

Affected product: Tenda W9. 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-2024-4242/ (Markdown: https://insights.sbomify.com/CVE-2024-4242/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-4242
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-4242
- OSV: https://osv.dev/vulnerability/CVE-2024-4242

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-4242/
Summaries are generated and may contain mistakes; the official description above is the record.