CVE-2026-42081
HIGH EPSS 18.2%
Published May 27, 20261mo ago · Modified Jun 17, 20261w ago
7.1 CVSS 3.1
Published May 27, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago
Description
free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, the AMF in Free5GC does not verify the UE Security Capabilities received in NGAP PathSwitchRequest messages against its locally stored values, as mandated by 3GPP TS 33.501 §6.7.3.1. A malicious gNB can overwrite the AMF's stored UE security capabilities with arbitrary values, which are then propagated in PathSwitchRequest Acknowledge messages and subsequent Handover Request messages. This leads to persistent handover denial-of-service for affected UEs. This vulnerability is fixed in 4.2.2.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H Attack Vector Adjacent
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity Low
Availability High
Threat Intelligence
EPSS Exploit Probability
18.2% percentile
Exploit & Patch Status
Public Exploit Known
No Patch Available
Weaknesses 1
CWE-358
Affected Products 1
| Vendor | Product | Version | Range |
|---|---|---|---|
| free5gc | free5gc | * | <4.2.2 |
References 1
- github.com https://github.com/free5gc/free5gc/security/advisories/GHSA-77x9-rf64-92gv
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.