# CVE-2021-26797: Auth bypass in n/a

> An attacker can gain system administrator access via an open Telnet service in Hame SD1 Wi-Fi firmware, leading to full device compromise.

- **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 Apr 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-2w3f-f73w-vf7r

## What is CVE-2021-26797?

CVE-2021-26797 is a critical authentication bypass vulnerability in n/a, published on 26 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An access control vulnerability in Hame SD1 Wi-Fi firmware <=V.20140224154640 allows an attacker to get system administrator through an open Telnet service.

Weakness: CWE-521 (Weak Password Requirements)

## Which versions are affected by CVE-2021-26797?

It affects 1 product.


Products: Hametech Hame Sd1 Wi-Fi Firmware.

## How do I fix CVE-2021-26797?

No fix has been published for CVE-2021-26797 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-26797 being exploited?

There is no known exploitation of CVE-2021-26797 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-26797 and fix it if it is affected.

What it is: CVE-2021-26797 is a critical authentication bypass vulnerability in n/a, published on 26 Apr 2021. 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-2021-26797 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-2021-26797/ (Markdown: https://insights.sbomify.com/CVE-2021-26797/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-26797
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-26797
- OSV: https://osv.dev/vulnerability/CVE-2021-26797

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-26797/
Summaries are generated and may contain mistakes; the official description above is the record.