# CVE-2024-56921: Denial of service in n/a

> A flaw in Open5gs AMF error handling allows remote attackers to crash the service via specific Registration requests, impacting 5G network availability.

- **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:** 3 Feb 2025
- **Updated:** 22 Mar 2025
- **Also known as:** GHSA-6wm8-q34j-2mc2

## What is CVE-2024-56921?

CVE-2024-56921 is a high-severity denial of service vulnerability in Open5gs Open5gs, published on 3 Feb 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered in Open5gs v2.7.2. InitialUEMessage, Registration request sent at a specific time can crash AMF due to incorrect error handling of gmm_state_exception() function upon receipt of the Nausf_UEAuthentication_Authenticate response.

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2024-56921?

It affects 1 product.


Products: Open5gs Open5gs.

## How do I fix CVE-2024-56921?

No fix has been published for CVE-2024-56921 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-56921 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-56921 exists.

## Other vulnerabilities in Open5gs Open5gs

- [CVE-2024-40130](https://insights.sbomify.com/CVE-2024-40130/): Memory corruption in n/a (critical 9.8)
- [CVE-2021-28122](https://insights.sbomify.com/CVE-2021-28122/): Missing authorization 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)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-56921 and fix it if it is affected.

What it is: CVE-2024-56921 is a high-severity denial of service vulnerability in Open5gs Open5gs, published on 3 Feb 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-56921 exists.

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-2024-56921/ (Markdown: https://insights.sbomify.com/CVE-2024-56921/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-56921
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-56921
- OSV: https://osv.dev/vulnerability/CVE-2024-56921

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-56921/
Summaries are generated and may contain mistakes; the official description above is the record.