# CVE-2024-4491: Tenda i21 formGetDiagnoseInfo stack-based overflow

> Remote attackers can trigger a stack-based buffer overflow in the Tenda i21 router via the formGetDiagnoseInfo function, 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:** 4 May 2024
- **Updated:** 1 Aug 2024
- **Also known as:** GHSA-pmf3-wffg-82x2

## What is CVE-2024-4491?

CVE-2024-4491 is a high-severity memory corruption vulnerability in Tenda i21, published on 4 May 2024. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability classified as critical was found in Tenda i21 1.0.0.14(4656). This vulnerability affects the function formGetDiagnoseInfo. The manipulation of the argument cmdinput leads to stack-based buffer overflow. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-263080. 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-2024-4491?

It affects 1 product.


Products: Tenda I21 Firmware.

## How do I fix CVE-2024-4491?

No fix has been published for CVE-2024-4491 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-4491 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-4491 exists.

## Other vulnerabilities in Tenda i21

- [CVE-2022-44362](https://insights.sbomify.com/CVE-2022-44362/): Memory corruption in n/a (critical 9.8)
- [CVE-2022-44363](https://insights.sbomify.com/CVE-2022-44363/): Memory corruption in n/a (critical 9.8)
- [CVE-2022-44365](https://insights.sbomify.com/CVE-2022-44365/): Memory corruption in n/a (critical 9.8)
- [CVE-2022-44366](https://insights.sbomify.com/CVE-2022-44366/): Memory corruption in n/a (critical 9.8)
- [CVE-2022-44367](https://insights.sbomify.com/CVE-2022-44367/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-4491 and fix it if it is affected.

What it is: CVE-2024-4491 is a high-severity memory corruption vulnerability in Tenda i21, published on 4 May 2024. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-4491 exists.

Affected product: Tenda i21. 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-2024-4491/ (Markdown: https://insights.sbomify.com/CVE-2024-4491/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-4491
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-4491
- OSV: https://osv.dev/vulnerability/CVE-2024-4491

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-4491/
Summaries are generated and may contain mistakes; the official description above is the record.