CVE-2026-30080Public exploitNetwork attack vector

Authentication bypass via integrity-free Security Mode Complete

Published Apr 8, 2026 · Updated Apr 8, 2026

Authentication bypass in OpenAirInterface CN5G AMF 2.2.0 allows remote attackers to complete registration without integrity protection. The AMF accepts an initial UE registration advertising only IA0, then processes a Security Mode Complete message with a zero MAC despite NIA1 and NIA2 configuration. Remote attackers able to send crafted NGAP and NAS registration traffic can obtain Registration Accept under a downgraded security context and replay messages.

CVSS severity7.5
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in OpenAirInterface CN5G AMF 2.2.0 allows remote attackers to complete registration without integrity protection. The AMF accepts an initial UE registration advertising only IA0, then processes a Security Mode Complete message with a zero MAC despite NIA1 and NIA2 configuration. Remote attackers able to send crafted NGAP and NAS registration traffic can obtain Registration Accept under a downgraded security context and replay messages.

The record

CVE
CVE-2026-30080
Published
Apr 8, 2026
Updated
Apr 8, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-294, T1550
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-294Authentication Bypass by Capture-replay
T1550Use Alternate Authentication Material

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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