What’s Vulnerable › Vulnerabilities

CVE-2025-8804: Open5GS AMF ngap_build_downlink_nas_transport assertion

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-08-10 · updated 2026-06-17
• Weakness: CWE-617

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.

Affected products

• Open5GS: before 2.7.6 — fixed in 2.7.6

How to fix

Upgrade to a fixed version: Open5GS 2.7.6. Check the vendor advisory for mitigations.

References

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

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