# CVE-2020-5762: Null dereference in Grandstream HT800 Series

> Unauthenticated remote attackers can cause a denial of service in Grandstream HT800 devices by triggering a null pointer dereference in the TR-069 service.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:** 29 Jul 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-gqxx-7rgw-867q

## What is CVE-2020-5762?

CVE-2020-5762 is a high-severity vulnerability in Grandstream HT800 Series, published on 29 Jul 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Grandstream HT800 series firmware version 1.0.17.5 and below is vulnerable to a denial of service attack against the TR-069 service. An unauthenticated remote attacker can stop the service due to a NULL pointer dereference in the TR-069 service. This condition is triggered due to mishandling of the HTTP Authentication field.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2020-5762?

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-2020-5762?

No fix has been published for CVE-2020-5762 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-5762 being exploited?

There is no known exploitation of CVE-2020-5762 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-2020-5763](https://insights.sbomify.com/CVE-2020-5763/): Hardcoded credentials in Grandstream HT800 Series (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)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-5762 and fix it if it is affected.

What it is: CVE-2020-5762 is a high-severity vulnerability in Grandstream HT800 Series, published on 29 Jul 2020. 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-2020-5762 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-2020-5762/ (Markdown: https://insights.sbomify.com/CVE-2020-5762/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-5762
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-5762
- OSV: https://osv.dev/vulnerability/CVE-2020-5762

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-5762/
Summaries are generated and may contain mistakes; the official description above is the record.