What is CVE-2025-66719?

CVE-2025-66719 is a critical-severity vulnerability in Free5gc Nrf, classified under Incorrect Authorization. CVSS score: 9.1/10. Published 2026-01-23.

How severe is CVE-2025-66719?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Auth bypass in Free5gc Nrf

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.

Vulnerability class: Broken Access Control

Published 2026-01-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (26.4th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 26.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.000

Affected products

Free5gc Nrf — versions 1.4.0

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

github.com/free5gc/free5gc/issues/736 (Exploit, Issue Tracking)
github.com/free5gc/nrf/pull/73 (Patch, Issue Tracking)

Frequently asked questions

What is CVE-2025-66719?: CVE-2025-66719 is a critical-severity vulnerability in Free5gc Nrf, classified under Incorrect Authorization. CVSS score: 9.1/10. Published 2026-01-23.
How severe is CVE-2025-66719?: Critical severity. CVSS v3 base score is 9.1 out of 10.