# CVE-2021-45626: Command injection in n/a

> Unauthenticated attackers can execute arbitrary commands on NETGEAR mesh routers via a command injection vulnerability.

- **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-79hm-7hpp-wj56

## What is CVE-2021-45626?

CVE-2021-45626 is a critical command injection vulnerability in Netgear Rbk20 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 command injection by an unauthenticated attacker. This affects RBK20 before 2.6.1.36, RBR20 before 2.6.1.36, RBS20 before 2.6.1.38, RBK40 before 2.6.1.36, RBR40 before 2.6.1.36, RBS40 before 2.6.1.38, RBK50 before 2.6.1.40, RBR50 before 2.6.1.40, RBS50 before 2.6.1.40, and RBS50Y before 2.6.1.40.

Weakness: CWE-77 (Improper Neutralization of Special Elements used in a Command)

## Which versions are affected by CVE-2021-45626?

It affects 10 products.


Products: Netgear Rbk20 Firmware, Netgear Rbk40 Firmware, Netgear Rbk50 Firmware, Netgear Rbr20 Firmware, Netgear Rbr40 Firmware, Netgear Rbr50 Firmware, Netgear Rbs20 Firmware, Netgear Rbs40 Firmware, Netgear Rbs50 Firmware, Netgear Rbs50y Firmware.

## How do I fix CVE-2021-45626?

No fix has been published for CVE-2021-45626 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-45626 being exploited?

There is no known exploitation of CVE-2021-45626 in the wild and no public exploit code.

## Other vulnerabilities in Netgear Rbk20 Firmware

- [CVE-2021-38530](https://insights.sbomify.com/CVE-2021-38530/): Command injection in n/a (critical 9.6)
- [CVE-2021-45593](https://insights.sbomify.com/CVE-2021-45593/): Command injection in n/a (high 8.4)
- [CVE-2021-45594](https://insights.sbomify.com/CVE-2021-45594/): Command injection in n/a (high 8.4)
- [CVE-2021-45659](https://insights.sbomify.com/CVE-2021-45659/): Code injection in n/a (high 7.1)
- [CVE-2021-45660](https://insights.sbomify.com/CVE-2021-45660/): Code injection in n/a (high 7.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-45626 and fix it if it is affected.

What it is: CVE-2021-45626 is a critical command injection vulnerability in Netgear Rbk20 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-2021-45626 in the wild and no public exploit code.

Affected product: Netgear Rbk20 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-2021-45626/ (Markdown: https://insights.sbomify.com/CVE-2021-45626/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-45626
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-45626
- OSV: https://osv.dev/vulnerability/CVE-2021-45626

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-45626/
Summaries are generated and may contain mistakes; the official description above is the record.