10

CVE-2026-44327

Exploit

free5GC: NEF nnef-oam route group is unauthenticated; no-token requests reach the OAM handler

free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's NEF mounts the nnef-oam route group without inbound OAuth2/bearer-token authorization. A network attacker who can reach NEF on the SBI can hit the OAM route with no Authorization header at all and the handler returns 200 OK. The current OAM handler is a stub that returns null, but the structural defect is route-group-scoped: the entire OAM route group has no inbound auth middleware, so every future OAM operation added to this group inherits the missing auth boundary by default. This vulnerability is fixed in 4.2.2.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Free5gc ≫ Free5gc Version < 4.2.2
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.31% 0.226
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
security-advisories@github.com 10 3.9 6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H
CWE-306 Missing Authentication for Critical Function

The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

CWE-862 Missing Authorization

The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

https://github.com/free5gc/nef/pull/23
Patch
Issue Tracking
https://github.com/free5gc/free5gc/security/advisories/GHSA-cmpj-2x3g-m7g3
Vendor Advisory
Exploit
https://github.com/free5gc/free5gc/issues/861
Exploit
Issue Tracking