# CVE-2026-3301: Totolink N300RH Web Management cstecgi.cgi setWebWlanIdx os command injection

> Remote attackers can execute arbitrary OS commands via the webWlanIdx parameter in the Totolink N300RH web management interface.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Feb 2026
- **Updated:** 27 Feb 2026
- **Also known as:** GHSA-jppp-pmhm-3cp9

## What is CVE-2026-3301?

CVE-2026-3301 is a critical command injection vulnerability in Totolink N300RH, published on 27 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A security flaw has been discovered in Totolink N300RH 6.1c.1353_B20190305. Affected by this vulnerability is the function setWebWlanIdx of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Performing a manipulation of the argument webWlanIdx results in os command injection. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command), CWE-77 (Improper Neutralization of Special Elements used in a Command)

## Which versions are affected by CVE-2026-3301?

It affects 1 product.


Products: Totolink N300rh Firmware.

## How do I fix CVE-2026-3301?

No fix has been published for CVE-2026-3301 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-3301 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3301 exists.

## Other vulnerabilities in Totolink N300RH

- [CVE-2025-6400](https://insights.sbomify.com/CVE-2025-6400/): TOTOLINK N300RH HTTP POST Message formPortFw buffer overflow (high 8.7)
- [CVE-2026-3696](https://insights.sbomify.com/CVE-2026-3696/): Totolink N300RH CGI cstecgi.cgi setWiFiWpsConfig os command injection (medium 6.9)
- [CVE-2025-4849](https://insights.sbomify.com/CVE-2025-4849/): TOTOLINK N300RH cstecgi.cgi CloudACMunualUpdateUserdata command injection (medium 5.3)
- [CVE-2025-4850](https://insights.sbomify.com/CVE-2025-4850/): TOTOLINK N300RH cstecgi.cgi setUnloadUserData command injection (medium 5.3)
- [CVE-2025-4851](https://insights.sbomify.com/CVE-2025-4851/): TOTOLINK N300RH cstecgi.cgi setUploadUserData command injection (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-3301 and fix it if it is affected.

What it is: CVE-2026-3301 is a critical command injection vulnerability in Totolink N300RH, published on 27 Feb 2026. 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-2026-3301 exists.

Affected product: Totolink N300RH. 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-2026-3301/ (Markdown: https://insights.sbomify.com/CVE-2026-3301/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-3301
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3301
- OSV: https://osv.dev/vulnerability/CVE-2026-3301

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-3301/
Summaries are generated and may contain mistakes; the official description above is the record.