Vulnerability in Free5gc
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.007 (52.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.007 · change: +0.003
Affected products
- Free5gc — versions 4.2.0
Weakness classification (CWE)
References
- vuldb.com/vuln/355485 (vdb-entry)
- vuldb.com/vuln/355485/cti (signature, permissions-required)
- vuldb.com/submit/785896 (third-party-advisory)
- github.com/free5gc/free5gc/issues/832 (issue-tracking)
- github.com/free5gc/amf/pull/201 (issue-tracking, patch)
- github.com/user-attachments/files/25581199/amfcfg.yaml (exploit)
- github.com/free5gc/free5gc/ (product)
Frequently asked questions
- What is CVE-2026-5661?
- CVE-2026-5661 is a medium-severity vulnerability in Free5gc, classified under Improper Resource Shutdown or Release. CVSS score: 5.3/10. Published 2026-04-06.
- How severe is CVE-2026-5661?
- Medium severity. CVSS v3 base score is 5.3 out of 10.