EUVD-2026-67111
GHSA-w95h-c964-fh89
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SUCI parsing occurs pre-authentication over the network requiring no credentials; impact is purely availability with no confidentiality or integrity effect.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
An issue in free5gc v4.0.1 allows attackers to cause a Denial of Service (DoS) when parsing crafted SUCI data during UE registration.
AnalysisAI
Denial of service in free5GC v4.0.1 affects the SUCI (Subscription Concealed Identifier) parsing routine invoked during 5G UE registration, allowing unauthenticated remote attackers to crash or resource-exhaust the core network by sending crafted SUCI payloads. With CVSS 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H), any attacker reachable on the AMF's N1/NAS interface can trigger the flaw before any subscriber authentication occurs. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to the free5GC AMF's N1/NAS interface and is triggered specifically during the UE registration procedure when the AMF processes the SUCI field in an initial NAS Registration Request - a stage that precedes mutual authentication, meaning no subscriber credentials or SIM provisioning is required to send the triggering message. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.5 High score is driven by the fully network-accessible, zero-authentication attack surface - any host reachable on the AMF's N1 interface can send crafted NAS Registration Requests. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch or fixed version has been independently confirmed at time of analysis - the only reference is an open GitHub issue (https://github.com/free5gc/free5gc/issues/769) rather than a tagged release or security advisory. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all systems running free5GC v4.0.1 and immediately restrict network access to the AMF's N1/NAS interface to known trusted sources via firewall rules; simultaneously notify your free5GC vendor contact and configure alerts for security advisories. …
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External POC / Exploit Code
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