---
title: "CVE-2025-66719: Free5gc NRF is vulnerable to scope validation bypass via maliciously crafted targetNF value"
url: https://erroneo.us/security/cve/CVE-2025-66719/
description: "CVE-2025-66719 (github.com/free5gc/nrf (Go)): An issue was discovered in Free5gc NRF 1.4.0. In the access-token generation logic of free5GC, the…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-01-23
date_modified: 2026-06-05
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-66719"
kev: false
cvss: 9.1
epss: 0.00361
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2025-66719: Free5gc NRF is vulnerable to scope validation bypass via maliciously crafted targetNF value

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.4% , percentile 29: FIRST’s model estimates a 0.4% chance of exploitation activity in the next 30 days, higher than 29% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes github.com/free5gc/nrf (Go) < 1.4.1, fixed in 1.4.1 . Check your lockfile, including transitive dependencies.

## What it is

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/accesstoken.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.

## Affected packages

- Go `github.com/free5gc/nrf` < 1.4.1 → fixed: 1.4.1

## Affected products (CVE record)

- n/a n/a: see advisory

## Severity

- CISA-ADP CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`
- GitHub CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable yes , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 0.36% probability of exploitation activity in the next 30 days; percentile 29.

## Sources

- [GitHub Advisory GHSA-q7c8-gfjh-8v4p](https://github.com/advisories/GHSA-q7c8-gfjh-8v4p)
- [CVE.org record CVE-2025-66719](https://www.cve.org/CVERecord?id=CVE-2025-66719)
- [NVD entry CVE-2025-66719](https://nvd.nist.gov/vuln/detail/CVE-2025-66719)
- [github.com](https://github.com/free5gc/free5gc/issues/736)
- [github.com](https://github.com/free5gc/nrf/pull/73)
- [github.com](https://github.com/free5gc/free5gc/issues/733)

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Source page: https://erroneo.us/security/cve/CVE-2025-66719/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt