# CVE-2020-21999: Command injection in n/a

> Authenticated attackers can execute arbitrary shell commands as root via the pingTest script in FaceSentry Access Control System.

- **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:** 4 May 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-gvmq-4gxq-mx44

## What is CVE-2020-21999?

CVE-2020-21999 is a high-severity command injection vulnerability in n/a, published on 4 May 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

iWT Ltd FaceSentry Access Control System 6.4.8 suffers from an authenticated OS command injection vulnerability using default credentials. This can be exploited to inject and execute arbitrary shell commands as the root user via the 'strInIP' POST parameter in pingTest PHP script.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2020-21999?

It affects 1 product.


Products: Iwt Facesentry Access Control System Firmware.

## How do I fix CVE-2020-21999?

No fix has been published for CVE-2020-21999 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-21999 being exploited?

There is no known exploitation of CVE-2020-21999 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2019-25241](https://insights.sbomify.com/CVE-2019-25241/): FaceSentry Access Control System 6.4.8 Remote SSH Root Access (critical 9.8)
- [CVE-2019-25278](https://insights.sbomify.com/CVE-2019-25278/): FaceSentry Access Control System 6.4.8 Authentication Credentials MiTM Disclosure (critical 9.1)
- [CVE-2019-25243](https://insights.sbomify.com/CVE-2019-25243/): FaceSentry 6.4.8 Authenticated Remote Command Injection via Ping Test (high 8.7)
- [CVE-2019-25279](https://insights.sbomify.com/CVE-2019-25279/): FaceSentry Access Control System 6.4.8 Cleartext Password Storage Vulnerability (medium 6.8)
- [CVE-2019-25277](https://insights.sbomify.com/CVE-2019-25277/): FaceSentry Access Control System 6.4.8 Reflected Cross-Site Scripting via pluginInstall.php (medium 5.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-21999 and fix it if it is affected.

What it is: CVE-2020-21999 is a high-severity command injection vulnerability in n/a, published on 4 May 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-2020-21999 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-2020-21999/ (Markdown: https://insights.sbomify.com/CVE-2020-21999/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-21999
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-21999
- OSV: https://osv.dev/vulnerability/CVE-2020-21999

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-21999/
Summaries are generated and may contain mistakes; the official description above is the record.