CVE-2025-70123: FREE5GC

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

An improper input validation and protocol compliance vulnerability in free5GC v4.0.1 allows remote attackers to cause a denial of service. The UPF incorrectly accepts a malformed PFCP Association Setup Request, violating 3GPP TS 29.244. This places the UPF in an inconsistent state where a subsequent valid PFCP Session Establishment Request triggers a cascading failure, disrupting the SMF connection and causing service degradation.

Affected products

• FREE5GC FREE5GC: version 4.0.1 only

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