CVE-2025-66719
CVE-2025-66719 is a critical-severity vulnerability in Free5gc Nrf with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-863.
Key facts
- Severity: Critical (CVSS 3.x base score 9.1)
- EPSS exploit prediction: 0% (29th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-4231
- Weakness: CWE-863
- Affected product: Free5gc Nrf
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2025-66719?
- 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.
- How severe is CVE-2025-66719?
- CVE-2025-66719 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
- Is CVE-2025-66719 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2025-66719?
- CVE-2025-66719 affects Free5gc Nrf. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2025-66719?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- Does CVE-2025-66719 have an EU (EUVD) identifier?
- Yes. CVE-2025-66719 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4231.
- When was CVE-2025-66719 published?
- CVE-2025-66719 was published on 2026-01-23 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:free5gc:nrf:1.4.0:*:*:*:*:*:*:*
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