# CVE-2021-37915: Command injection in n/a

> Attackers with shell access can set a malicious variable to execute arbitrary scripts from a remote host after reboot.

- **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:** 28 Oct 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-mfhv-6c62-c8w2

## What is CVE-2021-37915?

CVE-2021-37915 is a high-severity command injection vulnerability in n/a, published on 28 Oct 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

An issue was discovered on the Grandstream HT801 Analog Telephone Adaptor before 1.0.29.8. From the limited configuration shell, it is possible to set the malicious gdb_debug_server variable. As a result, after a reboot, the device downloads and executes malicious scripts from an attacker-defined host.

## Which versions are affected by CVE-2021-37915?

It affects 1 product.


Products: Grandstream Ht801 Firmware.

## How do I fix CVE-2021-37915?

No fix has been published for CVE-2021-37915 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-37915 being exploited?

There is no known exploitation of CVE-2021-37915 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2021-37748](https://insights.sbomify.com/CVE-2021-37748/): Memory corruption 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)
- [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-2021-37915 and fix it if it is affected.

What it is: CVE-2021-37915 is a high-severity command injection vulnerability in n/a, published on 28 Oct 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-37915 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-2021-37915/ (Markdown: https://insights.sbomify.com/CVE-2021-37915/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-37915
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-37915
- OSV: https://osv.dev/vulnerability/CVE-2021-37915

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-37915/
Summaries are generated and may contain mistakes; the official description above is the record.