Free5gc
CVE-2026-27643
MEDIUM
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A10:2025 - Mishandling of Exceptional Conditions
ASVS 5.0
V16 - Security Logging and Error Handling Error message sanitization
MITRE ATT&CK
1 technique across 1 tactic: Discovery The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS 5.3 (MEDIUM). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: None. Exploitable via remote/network. Public exploit/POC available. |
| Exploit ScenarioDerived | A remote attacker could exploit this vulnerability to compromise the affected system. |
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Alert meAnalysisAIv1 – Mar 12, 2026
Information disclosure in free5GC UDR versions up to 1.4.1 allows remote attackers to obtain detailed internal parsing error messages through the NEF component's Nnef_PfdManagement service, enabling service fingerprinting and reconnaissance. Public exploit code exists for this vulnerability, and all deployments using the affected service are at risk. A patch is available in pull request 56 and should be applied immediately, as no application-level workarounds exist.
Earlier versions of this analysis (1)
free5GC UDR is the user data repository (UDR) for free5GC, an an open-source project for 5th generation (5G) mobile core networks. [CVSS 5.3 MEDIUM]
RemediationAI
A vendor patch is available — apply it immediately. Restrict network access to the affected service where possible.
Affects your stack
Find out whether the stacks and servers you run are on an affected version.
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
Classified as CWE-209 (Error Message Information Leak). Affects Udr. free5GC UDR is the user data repository (UDR) for free5GC, an an open-source project for 5th generation (5G) mobile core networks. In versions up to and including 1.4.1, the NEF component reliably leaks internal parsing error details (e.g., invalid character 'n' after top-level value) to remote clients, which can aid attackers in service fingerprinting. All deployments of free5GC using the Nnef_PfdManagement service may be affected. free5gc/udr pull request 56 contains a patch for the issue. Th
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
Lifecycle Timeline
3DescriptionGitHub Advisory
free5GC UDR is the user data repository (UDR) for free5GC, an an open-source project for 5th generation (5G) mobile core networks. In versions up to and including 1.4.1, the NEF component reliably leaks internal parsing error details (e.g., invalid character 'n' after top-level value) to remote clients, which can aid attackers in service fingerprinting. All deployments of free5GC using the Nnef_PfdManagement service may be affected. free5gc/udr pull request 56 contains a patch for the issue. There is no direct workaround at the application level. The recommendation is to apply the provided patch.
Executive ViewAI
Organizations using versions should be aware of moderate risk from CVE-2026-27643 rated CVSS 5.3. Exploitation could compromise the security of affected deployments. Proof-of-concept code is publicly available. A patch is available and should be applied during regular vulnerability management.
Apply vendor patch. If patching is delayed: restrict network access and enable monitoring.
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.
Affected Products (CPE)GitHub Advisory
Free5gc NRF 1.4.0 has an authorization bypass in access token generation that allows authenticated users to request toke
free5gc UDM provides Unified Data Management (UDM) for free5GC, an open-source project for 5th generation (5G) mobile co
free5GC is an open-source project for 5th generation (5G) mobile core networks. Versions up to and including 1.4.1 of fr
An improper input validation and protocol compliance vulnerability in free5GC v4.0.1 allows remote attackers to cause a
free5GC is an open-source project for 5th generation (5G) mobile core networks. free5GC go-upf versions up to and includ
An issue was discovered in Free5GC v4.0.0 and v4.0.1 allowing an attacker to cause a denial of service via crafted POST
free5GC go-upf is the User Plane Function (UPF) implementation for 5G networks that is part of the free5GC project. Vers
An array index out of bounds vulnerability in the AMF component of free5GC v4.0.1 allows remote attackers to cause a den
A heap buffer overflow vulnerability in the UPF component of free5GC v4.0.1 allows remote attackers to cause a denial of
free5gc UDM provides Unified Data Management (UDM) for free5GC, an open-source project for 5th generation (5G) mobile co
free5gc v4.1.0 and before is vulnerable to Buffer Overflow. Rated high severity (CVSS 7.5), this vulnerability is remote
Free5gc 4.0.1 is vulnerable to Buffer Overflow. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitab
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