Free5GC up to 1.4.1 UDM Nudm_UECM unusual condition

Summaryinfo

A vulnerability labeled as problematic has been found in Free5GC up to 1.4.1. The affected element is the function Nudm_UECM of the component UDM. Executing a manipulation can lead to unusual condition. This vulnerability appears as CVE-2025-69250. The attack may be performed from remote. There is no available exploit. It is best practice to apply a patch to resolve this issue.

Detailsinfo

A vulnerability classified as problematic was found in Free5GC up to 1.4.1. This vulnerability affects the function Nudm_UECM of the component UDM. The manipulation with an unknown input leads to a unusual condition vulnerability. The CWE definition for the vulnerability is CWE-754. The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product. As an impact it is known to affect confidentiality. CVE summarizes:

free5gc UDM provides Unified Data Management (UDM) for free5GC, an open-source project for 5th generation (5G) mobile core networks. In versions up to and including 1.4.1, the service reliably leaks detailed internal error messages (e.g., strconv.ParseInt parsing errors) to remote clients when processing invalid pduSessionId inputs. This exposes implementation details and can be used for service fingerprinting. All deployments of free5GC using the UDM Nudm_UECM DELETE service may be vulnerable. free5gc/udm pull request 76 contains a fix for the issue. No direct workaround is available at the application level. Applying the official patch is recommended.

The advisory is available at github.com. This vulnerability was named CVE-2025-69250 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. Technical details are known, but there is no available exploit.

Applying the patch 504b14458d156558b3c0ade7107b86b3d5e72998 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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