How to fix CVE-2025-66719?

Within 24 hours: Identify all systems running Free5gc NRF 1.4.0 and assess their network exposure; implement network segmentation to restrict NRF access. Within 7 days: Apply the available vendor patch to all affected systems and validate successful deployment. Within 30 days: Conduct forensic logs review for indicators of exploitation and perform penetration testing to confirm remediation effectiveness.

Is Golang affected by CVE-2025-66719?

A critical vulnerability in Free5gc NRF 1.4.0 allows attackers to bypass authentication token scope validation, potentially granting unauthorized access to 5G network functions and sensitive subscriber data.

CVE-2025-66719

CRITICAL

2026-01-23 [email protected]

9.1

CVSS 3.1

CVSS Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Feb 11, 2026 - 19:55 vuln.today

Public exploit code

Patch Released

Feb 11, 2026 - 19:55 nvd

Patch available

CVE Published

Jan 23, 2026 - 16:15 nvd

CRITICAL 9.1

Description

An issue was discovered in Free5gc NRF 1.4.0. In the access-token generation logic of free5GC, the AccessTokenScopeCheck() function in file internal/sbi/processor/access_token.go bypasses all scope validation when the attacker uses a crafted targetNF value. This allows attackers to obtain an access token with any arbitrary scope.

Analysis

Free5gc NRF 1.4.0 has an authorization bypass in access token generation that allows authenticated users to request tokens with broader scope than permitted.

Technical Context

The AccessTokenScopeCheck function in Free5gc NRF (Network Repository Function) 1.4.0 has a CWE-863 incorrect authorization vulnerability that fails to properly validate token scope, allowing users to request overly permissive access tokens.

Affected Products

['Free5gc NRF 1.4.0']

Remediation

Update Free5gc. Review issued access tokens for overly permissive scopes.

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +0.1

CVSS: +46

POC: +20

CVE-2025-66719 vulnerability details – vuln.today

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CVE-2025-66719

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Lifecycle Timeline

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Analysis

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CVE-2025-66719

CVSS Vector

Lifecycle Timeline

Tags

Description

Analysis

Technical Context

Affected Products

Remediation

Priority Score

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External POC / Exploit Code