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**Name of the Vulnerable Software and Affected Versions** open5gs version 2.1.4 **Description** A buffer overflow issue exists in the AMF of open5gs. When the length of `MSIN` in `Supi` exceeds 24 characters, it leads to AMF denial of service. **Recommendations** For open5gs version 2.1.4, consider restricting the length of `MSIN` in `Supi` to 24 characters or less to prevent the buffer overflow issue until a patch is available.