CVE-2025-70123
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Improper Input Validation in free5GC UPF Causes DoS

Publication date: 2026-02-13

Last updated on: 2026-02-18

Assigner: MITRE

Description
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.

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Meta Information

Published
2026-02-13
Last Modified
2026-02-18
Generated
2026-07-06
AI Q&A
2026-02-13
EPSS Evaluated
2026-07-05
NVD
CVE-2025-70123
EUVD
EUVD-2025-207535

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
free5gc free5gc 4.0.1

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-20 The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

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Executive Summary

This vulnerability is an improper input validation and protocol compliance issue in free5GC version 4.0.1. Specifically, the User Plane Function (UPF) incorrectly accepts a malformed PFCP Association Setup Request, which violates the 3GPP TS 29.244 standard.

As a result, the UPF enters an inconsistent state. When a subsequent valid PFCP Session Establishment Request is received, it triggers a cascading failure that disrupts the Session Management Function (SMF) connection and causes service degradation.

Impact Analysis

This vulnerability can lead to a denial of service condition by causing the UPF to enter an inconsistent state and disrupting the SMF connection.

The cascading failure triggered by the malformed request results in service degradation, potentially affecting network availability and reliability.

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