# CVE-2020-5763: Hardcoded credentials in Grandstream HT800 Series

> An authenticated attacker can gain root access via a backdoor in the SSH service of Grandstream HT800 devices.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **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:** 29 Jul 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-h2gv-99w3-wrfr

## What is CVE-2020-5763?

CVE-2020-5763 is a high-severity vulnerability in Grandstream HT800 Series, published on 29 Jul 2020. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Grandstream HT800 series firmware version 1.0.17.5 and below contain a backdoor in the SSH service. An authenticated remote attacker can obtain a root shell by correctly answering a challenge prompt.

Weakness: CWE-326 (Inadequate Encryption Strength), CWE-489 (Active Debug Code)

## Which versions are affected by CVE-2020-5763?

It affects 6 products.


Products: Grandstream Ht801 Firmware, Grandstream Ht802 Firmware, Grandstream Ht812 Firmware, Grandstream Ht813 Firmware, Grandstream Ht814 Firmware, Grandstream Ht818 Firmware.

## How do I fix CVE-2020-5763?

No fix has been published for CVE-2020-5763 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-5763 being exploited?

There is no known exploitation of CVE-2020-5763 in the wild and no public exploit code.

## Other vulnerabilities in Grandstream HT800 Series

- [CVE-2021-37748](https://insights.sbomify.com/CVE-2021-37748/): Memory corruption in n/a (high 8.8)
- [CVE-2021-37915](https://insights.sbomify.com/CVE-2021-37915/): Command injection in n/a (high 8.8)
- [CVE-2020-5760](https://insights.sbomify.com/CVE-2020-5760/): Command injection in Grandstream HT800 Series (high 7.8)
- [CVE-2020-5761](https://insights.sbomify.com/CVE-2020-5761/): Denial of service in Grandstream HT800 Series (high 7.5)
- [CVE-2020-5762](https://insights.sbomify.com/CVE-2020-5762/): Null dereference in Grandstream HT800 Series (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-5763 and fix it if it is affected.

What it is: CVE-2020-5763 is a high-severity vulnerability in Grandstream HT800 Series, published on 29 Jul 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-5763 in the wild and no public exploit code.

Affected product: Grandstream HT800 Series. 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-2020-5763/ (Markdown: https://insights.sbomify.com/CVE-2020-5763/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-5763
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-5763
- OSV: https://osv.dev/vulnerability/CVE-2020-5763

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-5763/
Summaries are generated and may contain mistakes; the official description above is the record.