Vulnerability Description
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, remote attackers can inject control characters (e.g., %00) into the ueId parameter, triggering internal URL parsing errors (net/url: invalid control character). This exposes system implementation details and can aid in service fingerprinting. All deployments of free5GC using the UDM Nudm_UECM service may be affected. 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Free5Gc | Udm | <= 1.4.1 |
Related Weaknesses (CWE)
References
- https://github.com/free5gc/free5gc/issues/751ExploitIssue TrackingVendor Advisory
- https://github.com/free5gc/free5gc/issues/76ExploitIssue TrackingVendor Advisory
- https://github.com/free5gc/free5gc/security/advisories/GHSA-pwxh-4qh4-hgpqVendor Advisory
- https://github.com/free5gc/udm/commit/504b14458d156558b3c0ade7107b86b3d5e72998Patch
FAQ
What is CVE-2025-69251?
CVE-2025-69251 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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, remote attackers can inject ...
How severe is CVE-2025-69251?
CVE-2025-69251 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-69251?
Check the references section above for vendor advisories and patch information. Affected products include: Free5Gc Udm.