# CVE-2026-5679: Totolink A3300R cstecgi.cgi vsetTr069Cfg os command injection

> Attackers can execute arbitrary OS commands via the stun_pass parameter in the TR-069 configuration handler of Totolink A3300R routers.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 6 Apr 2026
- **Updated:** 7 Apr 2026
- **Also known as:** GHSA-cmq3-f6cg-p3p7

## What is CVE-2026-5679?

CVE-2026-5679 is a medium-severity command injection vulnerability in Totolink A3300R, published on 6 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A security vulnerability has been detected in Totolink A3300R 17.0.0cu.557_B20221024. The impacted element is the function vsetTr069Cfg of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument stun_pass leads to os command injection. The exploit has been disclosed publicly and may be used.

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-2026-5679?


## How do I fix CVE-2026-5679?

No fix has been published for CVE-2026-5679 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-5679 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5679 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-5679 and fix it if it is affected.

What it is: CVE-2026-5679 is a medium-severity command injection vulnerability in Totolink A3300R, published on 6 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5679 exists.

Affected product: Totolink A3300R. 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-2026-5679/ (Markdown: https://insights.sbomify.com/CVE-2026-5679/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-5679
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-5679
- OSV: https://osv.dev/vulnerability/CVE-2026-5679

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-5679/
Summaries are generated and may contain mistakes; the official description above is the record.