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CVE-2025-69251

free5GC has Improper Input Validation in UDM, Leading to Information Exposure

Published: Feb 23, 2026Updated: Feb 25, 2026 Sources: CVE List NVDCWE-20
5.3MEDIUM
NVD MITRE
EPSS Score
0.5%
Top 62.3%
CISA KEV
Not in KEV
Exploits
2 Known
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-20

Affected Products

free5gc
oss-projectaka free5gc udm, smf, free5gc smf, udm
udmOn-premNetwork Device
Networking Infrastructure / router-switch

Exploitability

2 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Initial Access
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References

https://github.com/free5gc/free5gc/issues/751
github.com
https://github.com/free5gc/free5gc/issues/76
github.com
https://github.com/free5gc/free5gc/security/advisories/GHSA-pwxh-4qh4-hgpq
github.com
and 1 more references View all →

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