What is the CVSS score of CVE-2025-70121?

CVE-2025-70121 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.1%.

Which versions of Free5gc are affected by CVE-2025-70121?

A denial of service vulnerability in free5GC v4.0.1 allows remote attackers to crash the 5G core network authentication component by sending specially crafted registration requests.

Is there a public PoC exploit available for CVE-2025-70121?

Yes, a public proof-of-concept exploit is available for CVE-2025-70121. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2025-70121?

Within 24 hours: Identify all free5GC v4.0.1 deployments and assess exposure to untrusted networks; implement network access controls to restrict NAS Registration Request sources to trusted base stations only. Within 7 days: Deploy WAF/DPI rules to detect and drop malformed 5GS Mobile Identity payloads in registration messages; document all affected systems and notify stakeholders of risk status. Within 30 days: Evaluate upgrade path to patched free5GC versions once available; implement enhanced monitoring and alerting for registration message anomalies; conduct incident response drills for potential DoS scenarios.

Free5gc CVE-2025-70121

HIGH

Out-of-bounds Read (CWE-125)

2026-02-13 cve@mitre.org

Denial Of Service Free5gc

7.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:02 vuln.today

PoC Detected

Feb 18, 2026 - 15:45 vuln.today

Public exploit code

CVE Published

Feb 13, 2026 - 17:16 nvd

HIGH 7.5

DescriptionCVE.org

An array index out of bounds vulnerability in the AMF component of free5GC v4.0.1 allows remote attackers to cause a denial of service via a crafted 5GS Mobile Identity in a NAS Registration Request message. The issue occurs in the GetSUCI method (NAS_MobileIdentity5GS.go) when accessing index 5 of a 5-element array, leading to a runtime panic and AMF crash.

AnalysisAI

Technical ContextAI

Classified as CWE-125 (Out-of-bounds Read). Affects the AMF component of Free5Gc. An array index out of bounds vulnerability in the AMF component of free5GC v4.0.1 allows remote attackers to cause a denial of service via a crafted 5GS Mobile Identity in a NAS Registration Request message. The issue occurs in the GetSUCI method (NAS_MobileIdentity5GS.go) when accessing index 5 of a 5-element array, leading to a runtime panic and AMF crash.

RemediationAI

Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.

CVE-2025-70121 vulnerability details – vuln.today

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Free5gc CVE-2025-70121

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

RemediationAI

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External POC / Exploit Code