# CVE-2018-21116: Other in n/a

> Unauthenticated attackers can execute arbitrary code on NETGEAR XR500 routers, requiring immediate firmware updates.

- **Severity:** High 8.8 (`CVSS:3.0/AC:L/AV:A/A:H/C:H/I:H/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:** 22 Apr 2020
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-v3cf-6qqq-jmch

## What is CVE-2018-21116?

CVE-2018-21116 is a high-severity vulnerability in Netgear Xr500 Firmware, published on 22 Apr 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

NETGEAR XR500 devices before 2.3.2.32 are affected by remote code execution by unauthenticated attackers.

## Which versions are affected by CVE-2018-21116?

It affects 1 product.


Products: Netgear Xr500 Firmware.

## How do I fix CVE-2018-21116?

No fix has been published for CVE-2018-21116 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-21116 being exploited?

There is no known exploitation of CVE-2018-21116 in the wild and no public exploit code.

## Other vulnerabilities in Netgear Xr500 Firmware

- [CVE-2018-21115](https://insights.sbomify.com/CVE-2018-21115/): Other in n/a (high 8.8)
- [CVE-2018-21117](https://insights.sbomify.com/CVE-2018-21117/): Command injection in n/a (high 8.8)
- [CVE-2018-21118](https://insights.sbomify.com/CVE-2018-21118/): Auth bypass in n/a (high 8.8)
- [CVE-2019-20655](https://insights.sbomify.com/CVE-2019-20655/): Command injection in n/a (high 7.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-21116 and fix it if it is affected.

What it is: CVE-2018-21116 is a high-severity vulnerability in Netgear Xr500 Firmware, published on 22 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-2018-21116 in the wild and no public exploit code.

Affected product: Netgear Xr500 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-2018-21116/ (Markdown: https://insights.sbomify.com/CVE-2018-21116/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-21116
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-21116
- OSV: https://osv.dev/vulnerability/CVE-2018-21116

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-21116/
Summaries are generated and may contain mistakes; the official description above is the record.