CVE-2025-69251: free5GC has Improper Input Validation in UDM, Leading to Information Exposure
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 NudmUECM 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.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2025-69251?
CVE-2025-69251 has a high severity rating due to its potential to lead to information exposure via improper input validation.
How do I fix CVE-2025-69251?
To fix CVE-2025-69251, upgrade free5GC UDM to version 1.4.2 or higher, where this vulnerability has been addressed.
What systems are affected by CVE-2025-69251?
CVE-2025-69251 affects all versions of free5GC UDM up to and including 1.4.1.
What is the impact of CVE-2025-69251 on free5GC UDM?
The impact of CVE-2025-69251 includes the risk of information exposure due to remote attackers being able to inject control characters.
Who can exploit CVE-2025-69251?
CVE-2025-69251 can be exploited by remote attackers who can send specially crafted requests to the vulnerable UDM component.