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CVE-2025-69251— free5GC has Improper Input Validation in UDM, Leading to Information Exposure

Quick assessment

Affected
free5gc udm
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

AI Predicted 5.3 Difficulty: Easy EPSS 0.48% · P39

Possible ATT&CK Techniques 1 AI

T1592.001 · Hardware
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
free5gc udm <= 1.4.1 -

II. Public POCs for CVE-2025-69251

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III. Intelligence Information for CVE-2025-69251

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Patches & Fixes for CVE-2025-69251 (2)

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 product: udm
Same vendor: free5gc
Same weakness: CWE-20

V. Comments for CVE-2025-69251

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