# CVE-2021-27231: Business logic in n/a

> Authenticated users can create subdomains for other customers' domains, enabling service or email spoofing in shared hosting environments.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N`)
- **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:** 16 Feb 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-g29r-mmqp-whm4

## What is CVE-2021-27231?

CVE-2021-27231 is a medium-severity vulnerability in n/a, published on 16 Feb 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Hestia Control Panel 1.3.5 and below, in a shared-hosting environment, sometimes allows remote authenticated users to create a subdomain for a different customer's domain name, leading to spoofing of services or email messages.

## Which versions are affected by CVE-2021-27231?

It affects 1 product.


Products: Hestiacp Control Panel.

## How do I fix CVE-2021-27231?

No fix has been published for CVE-2021-27231 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-27231 being exploited?

There is no known exploitation of CVE-2021-27231 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2022-2550](https://insights.sbomify.com/CVE-2022-2550/): OS Command Injection in hestiacp/hestiacp (critical 9.9)
- [CVE-2022-1509](https://insights.sbomify.com/CVE-2022-1509/): Command Injection Vulnerability in hestiacp/hestiacp (critical 9.9)
- [CVE-2022-2626](https://insights.sbomify.com/CVE-2022-2626/): Incorrect Privilege Assignment in hestiacp/hestiacp (critical 9.1)
- [CVE-2023-5839](https://insights.sbomify.com/CVE-2023-5839/): Privilege Chaining in hestiacp/hestiacp (high 8.8)
- [CVE-2025-30007](https://insights.sbomify.com/CVE-2025-30007/): HestiaCP < 1.9.5 Authenticated OS Command Injection via DNS Record Management (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-27231 and fix it if it is affected.

What it is: CVE-2021-27231 is a medium-severity vulnerability in n/a, published on 16 Feb 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-2021-27231 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-2021-27231/ (Markdown: https://insights.sbomify.com/CVE-2021-27231/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-27231
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-27231
- OSV: https://osv.dev/vulnerability/CVE-2021-27231

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-27231/
Summaries are generated and may contain mistakes; the official description above is the record.