CVE-2025-70121: FREE5GC

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

An array index out of bounds vulnerability in the AMF component of free5GC v4.0.1 allows remote attackers to cause a denial of service via a crafted 5GS Mobile Identity in a NAS Registration Request message. The issue occurs in the GetSUCI method (NAS_MobileIdentity5GS.go) when accessing index 5 of a 5-element array, leading to a runtime panic and AMF crash.

Affected products

• FREE5GC FREE5GC: version 4.0.1 only

Published 2026-02-13. Last modified 2026-06-17.