CVE-2026-30653: An issue in Free5GC v.4.2.0 and before allows a remote attacker to cause a denial of service via the function

Q: How do I fix CVE-2026-30653?

free5gc: upgrade to newer than 4.2.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-30653 being exploited?

CVE-2026-30653 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-30653 affect?

CVE-2026-30653 affects free5gc. Severity is high (CVSS 7.5). An issue in Free5GC v.4.2.0 and before allows a remote attacker to cause a denial of service via the function HandleAuthenticationFailure of the component AMF

Q: How urgent is CVE-2026-30653?

Priority 45/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2026-30653 is a high-severity flaw (CVSS 7.5) affecting free5gc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue in Free5GC v.4.2.0 and before allows a remote attacker to cause a denial of service via the function HandleAuthenticationFailure of the component AMF

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 65%)
CISA exploited list	No
Weakness	CWE-400
Published	2026-03-24
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: free5gc

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

Am I affected?

Timeline

2026-03-24 15:16 UTCPublished CVE record published
2026-06-17 10:32 UTCUpdated Record last modified

free5gc free5gc UPGRADE

Affected: <= 4.2.0

Fixed in: newer than 4.2.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy free5gc || rpm -q free5gc || free5gc --version

2. UPGRADE to newer than 4.2.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade free5gc

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade free5gc

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2026-30653?

free5gc: upgrade to newer than 4.2.0. Exact commands for each OS are on this page.

Is CVE-2026-30653 being exploited?

CVE-2026-30653 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-2026-30653 affect?

CVE-2026-30653 affects free5gc. Severity is high (CVSS 7.5). An issue in Free5GC v.4.2.0 and before allows a remote attacker to cause a denial of service via the function HandleAuthenticationFailure of the component AMF

How urgent is CVE-2026-30653?

Priority 45/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

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CVE-2026-41135 HIGH 7.5 UPGRADE UPGRADE free5GC UDR is the Policy Control Function (PCF) for free5GC, an an open-source project for 5th generation (5G
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References

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