CVE-2026-30079: In OpenAirInterface V2.2.0 AMF, Out of sequence messages causes incorrect state transition during UE registrat

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2026-30079 is a critical-severity flaw (CVSS 9.8) affecting oai-cn5g-amf. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In OpenAirInterface V2.2.0 AMF, Out of sequence messages causes incorrect state transition during UE registration procedure. This allows authentication to be bypassed completely. If a SecurityModeComplete message is sent after InitialUERegistration, a registration reject is received followed by a registration accept! This leads the UE to be registered without proper authentication.

Why this priority

Critical severity
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-288
Published	2026-04-07
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: openairinterface

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-07 15:17 UTCPublished CVE record published
2026-06-17 10:32 UTCUpdated Record last modified

openairinterface oai-cn5g-amf DOWNGRADE

Affected: 2.2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.2.0

1. Check installed version

apt-cache policy oai-cn5g-amf || rpm -q oai-cn5g-amf || oai-cn5g-amf --version

2. No fixed release: DOWNGRADE to a release before 2.2.0 (Debian / Ubuntu)

apt-cache madison oai-cn5g-amf sudo apt install oai-cn5g-amf=<VERSION_BEFORE_2.2.0> sudo apt-mark hold oai-cn5g-amf

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list oai-cn5g-amf sudo dnf downgrade oai-cn5g-amf-<VERSION_BEFORE_2.2.0> sudo dnf versionlock add oai-cn5g-amf

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora ELN · fonttools · FIXED · 4.68.0-1.eln159 · FEDORA-2026-37fa4b964c · source

sudo dnf upgrade --advisory=FEDORA-2026-37fa4b964c

Fedora 46 · fonttools · FIXED · 4.68.0-1.fc46 · FEDORA-2026-65d6c01c75 · source

sudo dnf upgrade --advisory=FEDORA-2026-65d6c01c75

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-30079?

oai-cn5g-amf: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-30079 being exploited?

CVE-2026-30079 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-30079 affect?

CVE-2026-30079 affects oai-cn5g-amf. Severity is critical (CVSS 9.8). In OpenAirInterface V2.2.0 AMF, Out of sequence messages causes incorrect state transition during UE registration procedure. This allows authentication to be bypassed completely. If a SecurityModeComplete message is sent after InitialUERegi

How urgent is CVE-2026-30079?

Priority 58/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-65805 HIGH 7.5 UPGRADE OpenAirInterface CN5G AMF<=v2.1.9 has a buffer overflow vulnerability in processing NAS messages
CVE-2026-30075 HIGH 7.5 DOWNGRADE OpenAirInterface Version 2.2.0 has a Buffer Overflow vulnerability in processing UplinkNASTransport containing
CVE-2026-30080 HIGH 7.5 DOWNGRADE OpenAirInterface v2.2.0 accepts Security Mode Complete without any integrity protection
CVE-2026-30078 HIGH 7.5 DOWNGRADE OpenAirInterface V2.2.0 AMF crashes when it receives an NGAP message with invalid procedure code or invalid PD

References

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