# CVE-2021-29066: Auth bypass in n/a

> Attackers can bypass authentication on NETGEAR mesh routers to gain unauthorized access to the device interface.

- **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:** 23 Mar 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-f24x-ggvm-qvpc

## What is CVE-2021-29066?

CVE-2021-29066 is a critical authentication bypass vulnerability in Netgear Rbk852 Firmware, published on 23 Mar 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 authentication bypass. This affects RBK852 before 3.2.17.12, RBK853 before 3.2.17.12, RBK854 before 3.2.17.12, RBR850 before 3.2.17.12, and RBS850 before 3.2.17.12.

## Which versions are affected by CVE-2021-29066?

It affects 5 products.


Products: Netgear Rbk852 Firmware, Netgear Rbk853 Firmware, Netgear Rbk854 Firmware, Netgear Rbr850 Firmware, Netgear Rbs850 Firmware.

## How do I fix CVE-2021-29066?

No fix has been published for CVE-2021-29066 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-29066 being exploited?

There is no known exploitation of CVE-2021-29066 in the wild and no public exploit code.

## Other vulnerabilities in Netgear Rbk852 Firmware

- [CVE-2021-29071](https://insights.sbomify.com/CVE-2021-29071/): Command injection in n/a (critical 9.6)
- [CVE-2021-29076](https://insights.sbomify.com/CVE-2021-29076/): Command injection in n/a (critical 9.6)
- [CVE-2021-29079](https://insights.sbomify.com/CVE-2021-29079/): Command injection in n/a (critical 9.6)
- [CVE-2020-26907](https://insights.sbomify.com/CVE-2020-26907/): Command injection in n/a (critical 9.6)
- [CVE-2021-29070](https://insights.sbomify.com/CVE-2021-29070/): Command injection in n/a (high 8.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-29066 and fix it if it is affected.

What it is: CVE-2021-29066 is a critical authentication bypass vulnerability in Netgear Rbk852 Firmware, published on 23 Mar 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-2021-29066 in the wild and no public exploit code.

Affected product: Netgear Rbk852 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-2021-29066/ (Markdown: https://insights.sbomify.com/CVE-2021-29066/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-29066
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-29066
- OSV: https://osv.dev/vulnerability/CVE-2021-29066

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-29066/
Summaries are generated and may contain mistakes; the official description above is the record.