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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.

The vulnerability identified as CVE-2025-66719 affects Free5gc NRF version 1.4.0, specifically within the access-token generation logic. The function AccessTokenScopeCheck(), located in internal/sbi/processor/access_token.go, is responsible for validating the scope of access tokens issued to network functions. However, due to improper validation logic, when an attacker crafts a specific targetNF value, the function bypasses all scope checks. This means that an attacker can request and obtain access tokens with arbitrary scopes, effectively granting them unauthorized permissions within the 5G core network. The NRF (Network Repository Function) is a pivotal component in the 5G core architecture, managing the registration and discovery of network functions and enforcing access control policies. By exploiting this flaw, an attacker could impersonate or escalate privileges across network functions, potentially leading to unauthorized data access, manipulation of network services, or disruption of 5G network operations. The vulnerability does not require user interaction but does require the attacker to send crafted requests to the NRF interface, which may be exposed internally or externally depending on network configuration. No CVSS score has been assigned yet, and no public patches or exploits are currently known. This vulnerability highlights a critical weakness in access control enforcement within a fundamental 5G core component.

Detailed information about CVE-2025-66719: n/a. Get real-time updates, technical details, and mitigation strategies.

CVE-2025-66719: n/a - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-66719: n/a

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