CVE-2025-69251— free5GC has Improper Input Validation in UDM, Leading to Information Exposure
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I. Basic Information for CVE-2025-69251
Vulnerability Information
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Vulnerability Title
free5GC has Improper Input Validation in UDM, Leading to Information Exposure
Source: NVD (National Vulnerability Database)
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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
free5gc UDM 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
free5gc UDM是free5GC开源的一个5G移动核心网络的核心网元。 free5gc UDM 1.4.1及之前版本存在安全漏洞，该漏洞源于远程攻击者可将控制字符注入ueId参数，触发内部URL解析错误，可能暴露系统实现细节并有助于服务指纹识别。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2025-69251
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Same Patch Batch · free5gc · 2026-02-23 · 7 CVEs total
| CVE-2025-69208 | free5GC UDR's NEF incorrectly returns 500 for missing PFD data (UDR 404) in Nnef_PfdManage | |
| CVE-2025-69247 | free5GC has Heap Buffer Overflow in UPF Leading to Denial of Service | |
| CVE-2025-69248 | free5GC has Array Index Out of Bounds in AMF Leading to Denial of Service | |
| CVE-2025-69232 | free5GC hasProtocol Compliance Violation in UPF Leading to SMF Service Disruption | |
| CVE-2025-69250 | free5GC has Improper Error Handling in UDM, Leading to Information Exposure | |
| CVE-2025-69252 | free5GC has Null Pointer Dereference in UDM, Leading to Service Panic |
IV. Related Vulnerabilities
Same vendor: free5gc
- CVE-2026-41136
free5GC AMF missing default case in Content-Type switch in H - CVE-2026-41135
free5GC PCF: Memory Leak via CORS Middleware Registration in - CVE-2026-40343
free5GC UDR: Fail-open handling in PolicyDataSubsToNotifyPos - CVE-2026-40249
free5gc UDR fail-open request handling in PolicyDataSubsToNo - CVE-2026-40248
free5gc UDR improper path validation allows unauthenticated
Same weakness: CWE-20
V. Comments for CVE-2025-69251
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