# CVE-2018-5770: Hardcoded credentials in n/a

> Remote attackers can enable telnet and use hardcoded root credentials to gain full control of Tenda AC15 routers.

- **Severity:** Critical 9.8 (`CVSS:3.0/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:** 20 Mar 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-79fv-qmj9-h56m

## What is CVE-2018-5770?

CVE-2018-5770 is a critical vulnerability in n/a, published on 20 Mar 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered on Tenda AC15 devices. A remote, unauthenticated attacker can make a request to /goform/telnet, creating a telnetd service on the device. This service is password protected; however, several default accounts exist on the device that are root accounts, which can be used to log in.

Weakness: CWE-1188 (Initialization of a Resource with an Insecure Default)

## Which versions are affected by CVE-2018-5770?

It affects 1 product.


Products: Tendacn Ac15 Firmware.

## How do I fix CVE-2018-5770?

No fix has been published for CVE-2018-5770 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-5770 being exploited?

There is no known exploitation of CVE-2018-5770 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2022-40853](https://insights.sbomify.com/CVE-2022-40853/): Memory corruption in n/a (critical 9.8)
- [CVE-2022-40860](https://insights.sbomify.com/CVE-2022-40860/): Memory corruption in n/a (critical 9.8)
- [CVE-2022-40862](https://insights.sbomify.com/CVE-2022-40862/): Memory corruption in n/a (critical 9.8)
- [CVE-2022-40864](https://insights.sbomify.com/CVE-2022-40864/): Memory corruption in n/a (critical 9.8)
- [CVE-2022-40865](https://insights.sbomify.com/CVE-2022-40865/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-5770 and fix it if it is affected.

What it is: CVE-2018-5770 is a critical vulnerability in n/a, published on 20 Mar 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2018-5770 in the wild and no public exploit code.

Affected product: n/a. 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-2018-5770/ (Markdown: https://insights.sbomify.com/CVE-2018-5770/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-5770
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-5770
- OSV: https://osv.dev/vulnerability/CVE-2018-5770

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-5770/
Summaries are generated and may contain mistakes; the official description above is the record.