# CVE-2026-30080: OpenAirInterface AMF integrity protection bypass in Security Mode Control

Source: https://junglewise.ai/threats/cve-2026-30080-openairinterface-amf-integrity-protection-bypass-in-security-mode  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-08. Updated: 2026-07-25  
License: CC BY 4.0 with a link back

CVE-2026-30080 · Severity: high · CVSS 7.5 · Published 2026-04-08

OpenAirInterface, an open-source implementation of 5G core network components, contains a security flaw in its Access and Mobility Management Function (AMF). The system incorrectly accepts connection requests that lack mandatory security protections, even when configured to require them. This allows an attacker to bypass integrity checks, potentially leading to the interception or replaying of mobile network signaling, which can compromise the reliability of the cellular connection.

Technologies: [Openairinterface Oai-Cn5g-Amf](https://junglewise.ai/threats/technologies/oai-cn5g-amf). Vendors: [Openairinterface](https://junglewise.ai/threats/vendors/openairinterface).

## Quick answers

**Is CVE-2026-30080 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-30080 being exploited in the wild.

**How severe is CVE-2026-30080?** High severity, with a CVSS score of 7.5, published 8 April 2026.

**Which products and versions are affected?** OpenAirInterface oai-cn5g-amf 2.2.0.

**Is there a fix for CVE-2026-30080?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-30080 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-30080?** Check whether you run Openairinterface Oai-Cn5g-Amf. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A vulnerability in OpenAirInterface (OAI) v2.2.0 AMF allows a security context downgrade during the initial registration procedure. Although the AMF may be configured to support NIA1 and NIA2 integrity algorithms, it incorrectly accepts a 'Security Mode Complete' message without integrity protection if a User Equipment (UE) claims to only support the IA0 (null integrity) algorithm. This occurs because the AMF proceeds with the registration instead of rejecting the UE's capability as per 3GPP specifications. An attacker can exploit this to bypass integrity checks and perform replay attacks on NAS (Non-Access Stratum) signaling. The issue is tracked in the OAI GitLab repository as issue #78.

## Affected products

- OpenAirInterface oai-cn5g-amf 2.2.0

## Timeline

- 2026-04-08: advisory: Initial disclosure of CVE-2026-30080

## References

- [https://gitlab.eurecom.fr/oai/cn5g/oai-cn5g-amf/-/issues/78](https://gitlab.eurecom.fr/oai/cn5g/oai-cn5g-amf/-/issues/78)

## Related threats

- [OpenAirInterface AUSF buffer overflow in UplinkNASTransport processing](https://junglewise.ai/threats/cve-2026-30075-openairinterface-ausf-buffer-overflow-in-uplinknastransport)
- [In OpenAirInterface V2.2.0 AMF, Out of sequence messages causes incorrect state transition during UE registration…](https://junglewise.ai/threats/cve-2026-30079-in-openairinterface-v2-2-0-amf-out-of-sequence-messages-causes)
- [OpenAirInterface CN5G AMF<=v2.0.1 There is a logical error when processing JSON format requests. Unauthorized remote…](https://junglewise.ai/threats/cve-2025-66786-openairinterface-cn5g-amf-v2-0-1-there-is-a-logical-error-when)
- [OpenAirInterface CN5G AMF<=v2.1.9 has a buffer overflow vulnerability in processing NAS messages. Unauthorized remote…](https://junglewise.ai/threats/cve-2025-65805-openairinterface-cn5g-amf-v2-1-9-has-a-buffer-overflow)