Is CVE-2026-44327 actively exploited?

No active exploitation of CVE-2026-44327 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-44327 be exploited remotely?

Yes. CVE-2026-44327 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-44327?

CVE-2026-44327 has a CVSS score of 10.0 (CRITICAL).

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CRITICAL

CVE-2026-44327

CWE-306Published: May 27, 2026· Updated: May 28, 2026

10.0

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:11.3th

Official Description

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.

NVD Source

Risk Analysis

A critical vulnerability in free5GC's NEF component allows a network attacker to access the OAM route group without any authorization. Although the current OAM handler is a stub, this structural defect means any future OAM operations added to this group will inherit the missing authentication, posing a significant security risk. The CVSS score of 10.0 highlights the extreme severity of this issue.

No public exploits are currently known for this vulnerability. The flaw is remotely exploitable with low attack complexity, indicating that an attacker could potentially exploit it over a network with minimal effort.

Recommended Action

Upgrade free5GC to version 4.2.2 or later to correct this authorization bypass. Ensure all NEF route groups, especially OAM, are protected by appropriate inbound authentication middleware.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2026-44327 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 10.0.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.