# CVE-2024-7334: TOTOLINK EX1200L cstecgi.cgi UploadCustomModule buffer overflow

> Remote attackers can exploit a buffer overflow in the UploadCustomModule function to execute arbitrary code on TOTOLINK EX1200L devices.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **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:** 1 Aug 2024
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-m48x-h45r-5jvm

## What is CVE-2024-7334?

CVE-2024-7334 is a high-severity memory corruption vulnerability in TOTOLINK EX1200L, published on 1 Aug 2024. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability was found in TOTOLINK EX1200L 9.3.5u.6146_B20201023. It has been rated as critical. This issue affects the function UploadCustomModule of the file /cgi-bin/cstecgi.cgi. The manipulation leads to buffer overflow. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. The identifier VDB-273257 was assigned to this vulnerability. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2024-7334?

It affects 1 product.


Products: Totolink Ex1200l Firmware.

## How do I fix CVE-2024-7334?

No fix has been published for CVE-2024-7334 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-7334 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-7334 exists.

## Other vulnerabilities in TOTOLINK EX1200L

- [CVE-2023-51033](https://insights.sbomify.com/CVE-2023-51033/): Command injection in n/a (critical 9.8)
- [CVE-2023-51035](https://insights.sbomify.com/CVE-2023-51035/): Command injection in n/a (critical 9.8)
- [CVE-2023-51034](https://insights.sbomify.com/CVE-2023-51034/): File upload in n/a (high 8.8)
- [CVE-2024-7908](https://insights.sbomify.com/CVE-2024-7908/): TOTOLINK EX1200L cstecgi.cgi setDefResponse stack-based overflow (high 8.7)
- [CVE-2024-7909](https://insights.sbomify.com/CVE-2024-7909/): TOTOLINK EX1200L cstecgi.cgi setLanguageCfg stack-based overflow (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-7334 and fix it if it is affected.

What it is: CVE-2024-7334 is a high-severity memory corruption vulnerability in TOTOLINK EX1200L, published on 1 Aug 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-2024-7334 exists.

Affected product: TOTOLINK EX1200L. 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-2024-7334/ (Markdown: https://insights.sbomify.com/CVE-2024-7334/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-7334
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-7334
- OSV: https://osv.dev/vulnerability/CVE-2024-7334

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-7334/
Summaries are generated and may contain mistakes; the official description above is the record.