# CVE-2024-6146: Actiontec WCB6200Q uh_get_postdata_withupload Stack-based Buffer Overflow Remote Code Execution Vulnerability

> Network-adjacent attackers can execute arbitrary code on Actiontec WCB6200Q routers via a stack-based buffer overflow in the HTTP server.

- **Severity:** High 8.8 (`CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Jun 2024
- **Updated:** 1 Aug 2024
- **Also known as:** GHSA-vfp8-2c95-8f3h

## What is CVE-2024-6146?

CVE-2024-6146 is a high-severity memory corruption vulnerability in Actiontec WCB6200Q, published on 18 Jun 2024. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Actiontec WCB6200Q uh_get_postdata_withupload Stack-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Actiontec WCB6200Q routers. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the HTTP server. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the HTTP server. Was ZDI-CAN-21418.

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

## Which versions are affected by CVE-2024-6146?

It affects 1 product.


Products: Actiontec Wcb6200q Firmware.

## How do I fix CVE-2024-6146?

No fix has been published for CVE-2024-6146 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-6146 being exploited?

There is no known exploitation of CVE-2024-6146 in the wild and no public exploit code.

## Other vulnerabilities in Actiontec WCB6200Q

- [CVE-2024-6142](https://insights.sbomify.com/CVE-2024-6142/): Actiontec WCB6200Q uh_tcp_recv_content Buffer Overflow Remote Code Execution Vulnerability (high 8.8)
- [CVE-2024-6143](https://insights.sbomify.com/CVE-2024-6143/): Actiontec WCB6200Q uh_tcp_recv_header Buffer Overflow Remote Code Execution Vulnerability (high 8.8)
- [CVE-2024-6144](https://insights.sbomify.com/CVE-2024-6144/): Actiontec WCB6200Q Multipart Boundary Stack-based Buffer Overflow Remote Code Execution Vulnerability (high 8.8)
- [CVE-2024-6145](https://insights.sbomify.com/CVE-2024-6145/): Actiontec WCB6200Q Cookie Format String Remote Code Execution Vulnerability (high 8.8)
- [CVE-2018-10252](https://insights.sbomify.com/CVE-2018-10252/): Auth bypass in n/a (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-6146 and fix it if it is affected.

What it is: CVE-2024-6146 is a high-severity memory corruption vulnerability in Actiontec WCB6200Q, published on 18 Jun 2024. 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-2024-6146 in the wild and no public exploit code.

Affected product: Actiontec WCB6200Q. 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-2024-6146/ (Markdown: https://insights.sbomify.com/CVE-2024-6146/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-6146
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-6146
- OSV: https://osv.dev/vulnerability/CVE-2024-6146

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From sbomify Insights: https://insights.sbomify.com/CVE-2024-6146/
Summaries are generated and may contain mistakes; the official description above is the record.