OpenAirInterface v2.2.0 accepts Security Mode Complete without any integrity protection.
Date: 2026-04
Affected: openairinterface/oai-cn5g-amf
Attack vector: other
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2026-30080
CWE: CWE-294
CVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)

OpenAirInterface v2.2.0 accepts Security Mode Complete without any integrity protection. Configuration has supported integrity NIA1 and NIA2. But if an UE sends initial registration request with only security capability IA0, OpenAirInterface accepts and proceeds. This downgrade security context can lead to the possibility of replay attack.


Mitigations:

Architectural layers (MAESTRO):