EUVD-2026-67117
GHSA-2qfh-4p2p-6qv4
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Registration handler is network-accessible with no authentication required, causing a process crash with no confidentiality or integrity impact.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
5DescriptionCVE.org
A NULL pointer dereference in the UDMC registration handler component of free5gc v4.0.1 allows attackers to cause a Denial of Service (DoS) via supplying crafted payload.
AnalysisAI
NULL pointer dereference in free5gc v4.0.1's UDMC registration handler exposes remote unauthenticated attackers to crashing the 5G core network process by submitting a specially crafted registration payload, resulting in complete availability loss of the affected network function. Any deployment with a network-accessible UDMC registration interface running free5gc v4.0.1 is at risk. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No special authentication or privilege is required - the UDMC registration handler is network-accessible and processes unauthenticated requests, consistent with CVSS PR:N and AV:N. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) accurately captures a straightforward network-accessible DoS with no authentication barrier and no complexity prerequisites. … 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 has been identified at time of analysis; the vulnerability is tracked as an open GitHub issue (https://github.com/free5gc/free5gc/issues/761) with no confirmed fix commit or tagged release. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Verify your deployment of free5gc version numbers and confirm whether v4.0.1 is in use; identify and document all systems running v4.0.1 and map their network exposure. …
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Same weakness CWE-476 – NULL Pointer Dereference
View allSame technique Denial Of Service
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External POC / Exploit Code
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