Imortai

**Name of the Vulnerable Software and Affected Versions** Free5GC versions prior to 4.2.0 **Description** A remote attacker can cause a denial of service in the AMF component through the `HandleAuthenticationFailure()` function. **Recommendations** Update to a version later than 4.2.0. As a temporary workaround, restrict access to the `HandleAuthenticationFailure()` function within the AMF component.