What’s Vulnerable › Vulnerabilities

CVE-2025-69247: free5GC has Heap Buffer Overflow in UPF Leading to Denial of Service

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-02-23 · updated 2026-06-17
• Weakness: CWE-122

Description

free5GC go-upf is the User Plane Function (UPF) implementation for 5G networks that is part of the free5GC project. Versions prior to 1.2.8 have a Heap-based Buffer Overflow (CWE-122) vulnerability leading to Denial of Service. Remote attackers can crash the UPF network element by sending a specially crafted PFCP Session Modification Request with an invalid SDF Filter length field. This causes a heap buffer overflow, resulting in complete service disruption for all connected UEs and potential cascading failures affecting the SMF. All deployments of free5GC using the UPF component may be affected. Version 1.2.8 of go-upf contains a fix.

Affected products

• free5gc go-upf: before 1.2.8 — fixed in 1.2.8

How to fix

Upgrade to a fixed version: free5gc go-upf 1.2.8. Check the vendor advisory for mitigations.

References

• https://github.com/free5gc/free5gc/issues/746
• https://github.com/free5gc/free5gc/security/advisories/GHSA-gf69-93xr-p23g
• https://github.com/free5gc/go-upf/commit/b798fe5ee6a984be492fa53958dd5f1305469f85
• https://github.com/free5gc/go-upf/pull/85

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