free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, the AMF in Free5GC does not enforce the concurrent security procedure rules defined in 3GPP TS 33.501 §6.9.5.1. The AMF does not check for ongoing N2 handover procedures before initiating a NAS Security Mode Command, and vice versa. This can lead to mismatches between NAS and AS security contexts in the network and the UE. This vulnerability is fixed in 4.2.2.
Fix
Patch, vendor advisory and mitigation references on NVD 2
- https://github.com/free5gc/free5gc/security/advisories/GHSA-vrrx-58h3-prmh Exploit, Vendor Advisory
- https://github.com/free5gc/free5gc/security/advisories/GHSA-vrrx-58h3-prmh Exploit, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 5.4 · free5gcNVD modified 2026-10-14 20:10
Affected (CPE criteria) 1
cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:*
References 2
- https://github.com/free5gc/free5gc/security/advisories/GHSA-vrrx-58h3-prmh Exploit, Vendor Advisory
- https://github.com/free5gc/free5gc/security/advisories/GHSA-vrrx-58h3-prmh Exploit, Vendor Advisory