# CVE-2025-15684: Open5GS CER init.c diam_log_func assertion

> Remote attackers can trigger a reachable assertion in the CER handler, causing a denial of service in Open5GS.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 12 Aug 2026
- **Updated:** 13 Aug 2026
- **Also known as:** GHSA-c5w8-855p-98pc

## What is CVE-2025-15684?

CVE-2025-15684 is a medium-severity denial of service vulnerability in Open5GS, published on 12 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability was detected in Open5GS up to 2.7.6. Affected is the function diam_log_func of the file lib/diameter/common/init.c of the component CER Handler. The manipulation results in reachable assertion. The attack can be executed remotely. The exploit is now public and may be used. Upgrading to version 2.7.7 is able to address this issue. The patch is identified as c1a803516a3c0485696cb9bcca7a80ad857c7383. It is advisable to upgrade the affected component.

Weakness: CWE-617 (Reachable Assertion)

## Which versions are affected by CVE-2025-15684?


## How do I fix CVE-2025-15684?

No fix has been published for CVE-2025-15684 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-15684 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-15684 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-15684 and fix it if it is affected.

What it is: CVE-2025-15684 is a medium-severity denial of service vulnerability in Open5GS, published on 12 Aug 2026. 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-2025-15684 exists.

Affected product: 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-2025-15684/ (Markdown: https://insights.sbomify.com/CVE-2025-15684/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-15684
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-15684
- OSV: https://osv.dev/vulnerability/CVE-2025-15684

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-15684/
Summaries are generated and may contain mistakes; the official description above is the record.