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CVE-2025-69251

MEDIUM

5.3

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.

CVE Details

CVSS v3.1 Score5.3

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published2/24/2026

Last Modified2/25/2026

Sourcenvd

Honeypot Sightings0

Affected Products

free5gc:udm

Weaknesses (CWE)

CWE-20

References

https://github.com/free5gc/free5gc/issues/751(security-advisories@github.com)

https://github.com/free5gc/free5gc/issues/76(security-advisories@github.com)

https://github.com/free5gc/free5gc/security/advisories/GHSA-pwxh-4qh4-hgpq(security-advisories@github.com)

https://github.com/free5gc/udm/commit/504b14458d156558b3c0ade7107b86b3d5e72998(security-advisories@github.com)

IOC Correlations

No correlations recorded

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