Free5GC up to 1.4.1 AMF Service array index

Summaryinfo

A vulnerability, which was classified as problematic, was found in Free5GC up to 1.4.1. Impacted is an unknown function of the component AMF Service. Executing a manipulation can lead to array index. This vulnerability is registered as CVE-2025-69248. It is possible to launch the attack remotely. No exploit is available. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability has been found in Free5GC up to 1.4.1 and classified as problematic. This vulnerability affects some unknown functionality of the component AMF Service. The manipulation with an unknown input leads to a array index vulnerability. The CWE definition for the vulnerability is CWE-129. The product uses untrusted input when calculating or using an array index, but the product does not validate or incorrectly validates the index to ensure the index references a valid position within the array. As an impact it is known to affect availability. CVE summarizes:

free5GC is an an open-source project for 5th generation (5G) mobile core networks. Versions up to and including 1.4.1 of free5GC's AMF service have a Buffer Overflow vulnerability leading to Denial of Service. Remote unauthenticated attackers can crash the AMF service by sending a specially crafted NAS Registration Request with a malformed 5GS Mobile Identity, causing complete denial of service for the 5G core network. All deployments of free5GC using the AMF component may be affected. Pull request 43 of the free5gc/nas repo contains a fix. No direct workaround is available at the application level. Applying the official patch is recommended.

The advisory is shared for download at github.com. This vulnerability was named CVE-2025-69248 since 12/30/2025. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available.

Applying the patch 0329a7ac3f314f210366c1b3c33dc29eded4ac5f is able to eliminate this problem. The bugfix is ready for download at github.com.

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Productinfo

Name

• Free5GC

Version

• 1.4.0
• 1.4.1

License

• open-source

Website

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

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