# CVE-2019-20739: Memory corruption in n/a

> An unauthenticated attacker can exploit a buffer overflow in NETGEAR R8500 routers to potentially execute arbitrary code.

- **Severity:** Medium 4.3 (`CVSS:3.0/AC:L/AV:A/A:L/C:N/I:N/PR:N/S:U/UI:N`)
- **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:** 16 Apr 2020
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-5m7v-v37g-x24f

## What is CVE-2019-20739?

CVE-2019-20739 is a medium-severity memory corruption vulnerability in Netgear R8500 Firmware, published on 16 Apr 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

NETGEAR R8500 devices before v1.0.2.128 are affected by a buffer overflow by an unauthenticated attacker.

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

## Which versions are affected by CVE-2019-20739?

It affects 1 product.


Products: Netgear R8500 Firmware.

## How do I fix CVE-2019-20739?

No fix has been published for CVE-2019-20739 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-20739 being exploited?

There is no known exploitation of CVE-2019-20739 in the wild and no public exploit code.

## Other vulnerabilities in Netgear R8500 Firmware

- [CVE-2022-27945](https://insights.sbomify.com/CVE-2022-27945/): Command injection in n/a (high 8.8)
- [CVE-2022-27946](https://insights.sbomify.com/CVE-2022-27946/): Command injection in n/a (high 8.8)
- [CVE-2022-27947](https://insights.sbomify.com/CVE-2022-27947/): Command injection in n/a (high 8.8)
- [CVE-2024-50993](https://insights.sbomify.com/CVE-2024-50993/): Command injection in n/a (high 8.0)
- [CVE-2024-51005](https://insights.sbomify.com/CVE-2024-51005/): Command injection in n/a (high 8.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-20739 and fix it if it is affected.

What it is: CVE-2019-20739 is a medium-severity memory corruption vulnerability in Netgear R8500 Firmware, published on 16 Apr 2020. 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-2019-20739 in the wild and no public exploit code.

Affected product: Netgear R8500 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-2019-20739/ (Markdown: https://insights.sbomify.com/CVE-2019-20739/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-20739
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-20739
- OSV: https://osv.dev/vulnerability/CVE-2019-20739

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-20739/
Summaries are generated and may contain mistakes; the official description above is the record.