# CVE-2021-45611: Memory corruption in n/a

> Unauthenticated attackers can exploit a buffer overflow in various NETGEAR routers to execute arbitrary code.

- **Severity:** Critical 9.6 (`CVSS:3.1/AC:L/AV:A/A:H/C:H/I:H/PR:N/S:C/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:** 26 Dec 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-5m6r-6p2x-4hr9

## What is CVE-2021-45611?

CVE-2021-45611 is a critical memory corruption 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 a buffer overflow by an unauthenticated attacker. This affects DC112A before 1.0.0.52, R6400 before 1.0.1.68, RAX200 before 1.0.3.106, WNDR3400v3 before 1.0.1.38, XR300 before 1.0.3.68, R8500 before 1.0.2.144, RAX75 before 1.0.3.106, R8300 before 1.0.2.144, and RAX80 before 1.0.3.106.

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

## Which versions are affected by CVE-2021-45611?

It affects 9 products.


Products: Netgear Dc112a Firmware, Netgear R6400 Firmware, Netgear R8300 Firmware, Netgear R8500 Firmware, Netgear Rax200 Firmware, Netgear Rax75 Firmware, Netgear Rax80 Firmware, Netgear Wndr3400v3 Firmware, Netgear Xr300 Firmware.

## How do I fix CVE-2021-45611?

No fix has been published for CVE-2021-45611 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-45611 being exploited?

There is no known exploitation of CVE-2021-45611 in the wild and no public exploit code.

## Other vulnerabilities in Netgear R6400 Firmware

- [CVE-2025-28219](https://insights.sbomify.com/CVE-2025-28219/): Command injection in n/a (critical 9.8)
- [CVE-2023-38925](https://insights.sbomify.com/CVE-2023-38925/): Memory corruption in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-45611 and fix it if it is affected.

What it is: CVE-2021-45611 is a critical memory corruption 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-2021-45611 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-2021-45611/ (Markdown: https://insights.sbomify.com/CVE-2021-45611/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-45611
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-45611
- OSV: https://osv.dev/vulnerability/CVE-2021-45611

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-45611/
Summaries are generated and may contain mistakes; the official description above is the record.