# CVE-2020-35713: Command injection in n/a

> Remote attackers can execute arbitrary commands or reset passwords on Belkin Linksys RE6500 devices via shell metacharacters in the admin page.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Dec 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-8r9p-9pp7-xxpc

## What is CVE-2020-35713?

CVE-2020-35713 is a critical command injection vulnerability in Linksys Re6500 Firmware, published on 26 Dec 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Belkin LINKSYS RE6500 devices before 1.0.012.001 allow remote attackers to execute arbitrary commands or set a new password via shell metacharacters to the goform/setSysAdm page.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2020-35713?

It affects 1 product.


Products: Linksys Re6500 Firmware.

## How do I fix CVE-2020-35713?

No fix has been published for CVE-2020-35713 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-35713 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-35713 exists.

Public exploit code:

- CVE-2020-35713 (github_poc): https://github.com/Al1ex/CVE-2020-35713
- Belkin Linksys RE6500 <1.0.012.001 - Remote Command Execution (nuclei): http/cves/2020/CVE-2020-35713.yaml

## Other vulnerabilities in Linksys Re6500 Firmware

- [CVE-2020-35714](https://insights.sbomify.com/CVE-2020-35714/): Command injection in n/a (high 8.8)
- [CVE-2020-35715](https://insights.sbomify.com/CVE-2020-35715/): Command injection in n/a (high 8.8)
- [CVE-2020-35716](https://insights.sbomify.com/CVE-2020-35716/): Denial of service in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-35713 and fix it if it is affected.

What it is: CVE-2020-35713 is a critical command injection vulnerability in Linksys Re6500 Firmware, published on 26 Dec 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-35713 exists.

Affected product: Linksys Re6500 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-2020-35713/ (Markdown: https://insights.sbomify.com/CVE-2020-35713/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-35713
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-35713
- OSV: https://osv.dev/vulnerability/CVE-2020-35713

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-35713/
Summaries are generated and may contain mistakes; the official description above is the record.