Wei Guo

**Name of the Vulnerable Software and Affected Versions** Open5GS versions up to 2.7.2 **Description** A denial of service issue has been found in the `gmm state authentication` function of the file `src/amf/gmm-sm.c` in the component AMF. This issue can be exploited remotely, leading to a network-wide outage, causing all registered UEs to lose connectivity, and blocking new registrations until the AMF is restarted. The exploit has been disclosed to the public and may be used. **Recommendations** To fix this issue, apply the patch named `e31e9965f00d9c744a7f728497cb4f3e97744ee8` to the affected Open5GS version. As a temporary workaround, consider restricting access to the `gmm state authentication` function until a patch is available.

**Name of the Vulnerable Software and Affected Versions** Open5GS versions up to 2.7.2 **Description** A vulnerability was found in the function `amf nsmf pdusession handle update sm context` of the file src/amf/nsmf-handler.c of the component AMF. The manipulation leads to denial of service. The attack can be launched remotely. This issue allows a single UE to crash the AMF, resulting in the complete loss of mobility and session management services and causing a network-wide outage. All registered UEs will lose connectivity, and new registrations will be blocked until the AMF is restarted, leading to a high availability impact. **Recommendations** To resolve the issue, apply a patch to fix this problem. As a temporary workaround, consider restricting access to the vulnerable function `amf nsmf pdusession handle update sm context` until a patch is available.