# CVE-2021-45516: Denial of service in n/a

> Attackers can cause a denial of service on specific NETGEAR routers and mesh systems, requiring firmware updates to mitigate.

- **Severity:** Medium 6.9 (`CVSS:3.1/AC:L/AV:A/A:H/C:N/I:L/PR:H/S:C/UI:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Dec 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-ww8f-mqhh-q395

## What is CVE-2021-45516?

CVE-2021-45516 is a medium-severity denial of service vulnerability in Netgear R6400 Firmware, published on 26 Dec 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Certain NETGEAR devices are affected by denial of service. This affects R6400 before 1.0.1.70, R7000 before 1.0.11.126, R6900P before 1.3.3.140, R7000P before 1.3.3.140, R8000 before 1.0.4.74, RBK852 before 3.2.10.11, RBR850 before 3.2.10.11, and RBS850 before 3.2.10.11.

## Which versions are affected by CVE-2021-45516?

It affects 8 products.


Products: Netgear R6400 Firmware, Netgear R6900p Firmware, Netgear R7000 Firmware, Netgear R7000p Firmware, Netgear R8000 Firmware, Netgear Rbk852 Firmware, Netgear Rbr850 Firmware, Netgear Rbs850 Firmware.

## How do I fix CVE-2021-45516?

No fix has been published for CVE-2021-45516 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-45516 being exploited?

There is no known exploitation of CVE-2021-45516 in the wild and no public exploit code.

## Other vulnerabilities in Netgear R6400 Firmware

- [CVE-2017-18864](https://insights.sbomify.com/CVE-2017-18864/): Memory corruption in n/a (high 8.8)
- [CVE-2021-45554](https://insights.sbomify.com/CVE-2021-45554/): Command injection in n/a (high 8.4)
- [CVE-2020-11789](https://insights.sbomify.com/CVE-2020-11789/): Command injection in n/a (high 8.3)
- [CVE-2021-38515](https://insights.sbomify.com/CVE-2021-38515/): Denial of service in n/a (high 7.4)
- [CVE-2021-45655](https://insights.sbomify.com/CVE-2021-45655/): Code injection in n/a (medium 6.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-45516 and fix it if it is affected.

What it is: CVE-2021-45516 is a medium-severity denial of service vulnerability in Netgear R6400 Firmware, published on 26 Dec 2021. 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-2021-45516 in the wild and no public exploit code.

Affected product: Netgear R6400 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-2021-45516/ (Markdown: https://insights.sbomify.com/CVE-2021-45516/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-45516
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-45516
- OSV: https://osv.dev/vulnerability/CVE-2021-45516

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-45516/
Summaries are generated and may contain mistakes; the official description above is the record.