# CVE-2024-12147: Netgear R6900 HTTP Header upgrade_check.cgi buffer overflow

> Remote attackers can trigger a buffer overflow in the HTTP header handler of unsupported Netgear R6900 routers, potentially leading to code execution or denial of service.

- **Severity:** High 7.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/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:** 4 Dec 2024
- **Updated:** 14 Jan 2025
- **Also known as:** GHSA-875c-9gcv-8c6h

## What is CVE-2024-12147?

CVE-2024-12147 is a high-severity memory corruption vulnerability in Netgear R6900, published on 4 Dec 2024. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability was found in Netgear R6900 1.0.1.26_1.0.20. It has been declared as critical. Affected by this vulnerability is an unknown functionality of the file upgrade_check.cgi of the component HTTP Header Handler. The manipulation of the argument Content-Length leads to buffer overflow. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. This vulnerability only affects products that are no longer supported by the maintainer.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2024-12147?


## How do I fix CVE-2024-12147?

No fix has been published for CVE-2024-12147 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-12147 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-12147 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-12147 and fix it if it is affected.

What it is: CVE-2024-12147 is a high-severity memory corruption vulnerability in Netgear R6900, published on 4 Dec 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-2024-12147 exists.

Affected product: Netgear R6900. 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-2024-12147/ (Markdown: https://insights.sbomify.com/CVE-2024-12147/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-12147
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-12147
- OSV: https://osv.dev/vulnerability/CVE-2024-12147

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-12147/
Summaries are generated and may contain mistakes; the official description above is the record.