# CVE-2026-6989: Tenda F453 Telnet Service telnet TendaTelnet command injection

> Remote attackers can execute arbitrary commands on Tenda F453 routers via the Telnet service, potentially compromising the device.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/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:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 25 Apr 2026
- **Updated:** 27 Apr 2026
- **Also known as:** GHSA-g649-hgqw-vrxr

## What is CVE-2026-6989?

CVE-2026-6989 is a medium-severity command injection vulnerability in Tenda F453, published on 25 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability has been found in Tenda F453 up to 1.0.0.3. Impacted is the function TendaTelnet of the file /goform/telnet of the component Telnet Service. Such manipulation leads to command injection. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.

Weakness: CWE-77 (Improper Neutralization of Special Elements used in a Command), CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component)

## Which versions are affected by CVE-2026-6989?

It affects 1 product.


Products: Tenda F453 Firmware.

## How do I fix CVE-2026-6989?

No fix has been published for CVE-2026-6989 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-6989 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-6989 exists.

## Other vulnerabilities in Tenda F453

- [CVE-2026-5021](https://insights.sbomify.com/CVE-2026-5021/): Tenda F453 httpd PPTPUserSetting fromPPTPUserSetting stack-based overflow (high 8.7)
- [CVE-2026-4551](https://insights.sbomify.com/CVE-2026-4551/): Tenda F453 Parameters SafeClientFilter fromSafeClientFilter memory corruption (high 8.7)
- [CVE-2026-4552](https://insights.sbomify.com/CVE-2026-4552/): Tenda F453 Parameters VirtualSer fromVirtualSer memory corruption (high 8.7)
- [CVE-2026-4553](https://insights.sbomify.com/CVE-2026-4553/): Tenda F453 Parameters Natlimit fromNatlimit stack-based overflow (high 8.7)
- [CVE-2026-3726](https://insights.sbomify.com/CVE-2026-3726/): Tenda F453 webExcptypemanFilter fromwebExcptypemanFilter stack-based overflow (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-6989 and fix it if it is affected.

What it is: CVE-2026-6989 is a medium-severity command injection vulnerability in Tenda F453, published on 25 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-6989 exists.

Affected product: Tenda F453. 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-2026-6989/ (Markdown: https://insights.sbomify.com/CVE-2026-6989/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-6989
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-6989
- OSV: https://osv.dev/vulnerability/CVE-2026-6989

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-6989/
Summaries are generated and may contain mistakes; the official description above is the record.