Free5GC 4.1.0 LocalNode.DeleteSess/LocalNode.Sess denial of service

Summaryinfo

A vulnerability, which was classified as problematic, was found in Free5GC 4.1.0. Affected by this vulnerability is the function LocalNode.DeleteSess/LocalNode.Sess. The manipulation results in denial of service. This vulnerability was named CVE-2025-65562. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Free5GC 4.1.0. Affected is the function LocalNode.DeleteSess/LocalNode.Sess. The manipulation with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability. CVE summarizes:

The free5GC UPF suffers from a lack of bounds checking on the SEID when processing PFCP Session Deletion Requests. An unauthenticated remote attacker can send a request with a very large SEID (e.g., 0xFFFFFFFFFFFFFFFF) that causes an integer conversion/underflow in LocalNode.DeleteSess() / LocalNode.Sess() when a uint64 SEID is converted to int and used in index arithmetic. This leads to a negative index into n.sess and a Go runtime panic, resulting in a denial of service (UPF crash). The issue has been reproduced on free5GC v4.1.0 with crashes observed in the session lookup/deletion path in internal/pfcp/node.go; other versions may also be affected. No authentication is required.

The advisory is available at github.com. This vulnerability is traded as CVE-2025-65562 since 11/18/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

• Free5GC

Version

• 4.1.0

Website

• Product: https://github.com/free5gc/free5gc/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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