How severe is CVE-2026-5661?

CVE-2026-5661 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2026-5661 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-5661?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-5661 have an EU (EUVD) identifier?

Yes. CVE-2026-5661 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19241.

When was CVE-2026-5661 published?

CVE-2026-5661 was published on 2026-04-06 and last updated on 2026-06-17.

CVE-2026-5661

CVE-2026-5661 is a medium-severity vulnerability with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-404.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
CVSS v4: 5.5
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19241
Weakness: CWE-404
Published: 2026-04-06
Last modified: 2026-06-17

Description

A vulnerability was identified in Free5GC 4.2.0. This affects an unknown function of the component NGSetupRequest Handler. Such manipulation leads to denial of service. The attack may be launched remotely. The exploit is publicly available and might be used.

Frequently asked questions

What is CVE-2026-5661?: A vulnerability was identified in Free5GC 4.2.0. This affects an unknown function of the component NGSetupRequest Handler. Such manipulation leads to denial of service. The attack may be launched remotely. The exploit is publicly available and might be used.
How severe is CVE-2026-5661?: CVE-2026-5661 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2026-5661 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-5661?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-5661 have an EU (EUVD) identifier?: Yes. CVE-2026-5661 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19241.
When was CVE-2026-5661 published?: CVE-2026-5661 was published on 2026-04-06 and last updated on 2026-06-17.

References

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