# CVE-2021-28122: Missing authorization in n/a

> Unauthenticated attackers can modify subscriber data and create admin users in Open5GS WebUI due to missing authentication checks.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:** 10 Mar 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-66wx-wcfh-hv4g

## What is CVE-2021-28122?

CVE-2021-28122 is a critical missing authorization vulnerability in Open5gs Open5gs, published on 10 Mar 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A request-validation issue was discovered in Open5GS 2.1.3 through 2.2.x before 2.2.1. The WebUI component allows an unauthenticated user to use a crafted HTTP API request to create, read, update, or delete entries in the subscriber database. For example, new administrative users can be added. The issue occurs because Express is not set up to require authentication.

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2021-28122?

It affects 1 product.


Products: Open5gs Open5gs.

## How do I fix CVE-2021-28122?

No fix has been published for CVE-2021-28122 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-28122 being exploited?

There is no known exploitation of CVE-2021-28122 in the wild and no public exploit code.

## Other vulnerabilities in Open5gs Open5gs

- [CVE-2024-40130](https://insights.sbomify.com/CVE-2024-40130/): Memory corruption in n/a (critical 9.8)
- [CVE-2021-25863](https://insights.sbomify.com/CVE-2021-25863/): Hardcoded credentials in n/a (high 8.8)
- [CVE-2025-41067](https://insights.sbomify.com/CVE-2025-41067/): Reachable Assertion vulnerability in Open5GS (high 8.7)
- [CVE-2025-41068](https://insights.sbomify.com/CVE-2025-41068/): Reachable Assertion vulnerability in Open5GS (high 8.7)
- [CVE-2023-37015](https://insights.sbomify.com/CVE-2023-37015/): Denial of service in n/a (high 8.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-28122 and fix it if it is affected.

What it is: CVE-2021-28122 is a critical missing authorization vulnerability in Open5gs Open5gs, published on 10 Mar 2021. 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-2021-28122 in the wild and no public exploit code.

Affected product: Open5gs Open5gs. 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-2021-28122/ (Markdown: https://insights.sbomify.com/CVE-2021-28122/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-28122
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-28122
- OSV: https://osv.dev/vulnerability/CVE-2021-28122

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-28122/
Summaries are generated and may contain mistakes; the official description above is the record.