# CVE-2019-20740: Memory corruption in n/a

> Authenticated attackers can exploit a stack-based buffer overflow in NETGEAR routers to execute arbitrary code or escalate privileges.

- **Severity:** Medium 6.3 (`CVSS:3.0/AC:H/AV:A/A:H/C:H/I:H/PR:H/S:U/UI:R`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 16 Apr 2020
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-9j2r-7wv5-9gxw

## What is CVE-2019-20740?

CVE-2019-20740 is a medium-severity memory corruption vulnerability in Netgear R8300 Firmware, published on 16 Apr 2020. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

Certain NETGEAR devices are affected by a stack-based buffer overflow by an authenticated user. This affects DGN2200v4 before 1.0.0.110, DGND2200Bv4 before 1.0.0.109, R7300 before 1.0.0.70, R8300 before 1.0.2.130, and R8500 before 1.0.2.130.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2019-20740?

It affects 5 products.


Products: Netgear Dgn2200 Firmware, Netgear Dgnd2200b Firmware, Netgear R7300 Firmware, Netgear R8300 Firmware, Netgear R8500 Firmware.

## How do I fix CVE-2019-20740?

No fix has been published for CVE-2019-20740 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-20740 being exploited?

There is no known exploitation of CVE-2019-20740 in the wild and no public exploit code.

## Other vulnerabilities in Netgear R8300 Firmware

- [CVE-2017-6077](https://insights.sbomify.com/CVE-2017-6077/): NETGEAR DGN2200 Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2019-17373](https://insights.sbomify.com/CVE-2019-17373/): Auth bypass in n/a (critical 9.8)
- [CVE-2016-5649](https://insights.sbomify.com/CVE-2016-5649/): Netgear DGN2200 and DGND3700 disclose the administrator password (critical 9.8)
- [CVE-2024-57046](https://insights.sbomify.com/CVE-2024-57046/): Auth bypass in n/a (high 8.8)
- [CVE-2017-18755](https://insights.sbomify.com/CVE-2017-18755/): Cross-site request forgery in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-20740 and fix it if it is affected.

What it is: CVE-2019-20740 is a medium-severity memory corruption vulnerability in Netgear R8300 Firmware, published on 16 Apr 2020. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2019-20740 in the wild and no public exploit code.

Affected product: Netgear R8300 Firmware. 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-2019-20740/ (Markdown: https://insights.sbomify.com/CVE-2019-20740/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-20740
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-20740
- OSV: https://osv.dev/vulnerability/CVE-2019-20740

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-20740/
Summaries are generated and may contain mistakes; the official description above is the record.