What is CVE-2025-56394?

CVE-2025-56394 is a high-severity vulnerability in Free5gc, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2025-09-23.

How severe is CVE-2025-56394?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Free5gc

CVE-2025-56394

Free5gc 4.0.1 is vulnerable to Buffer Overflow. The AMF incorrectly validates the 5GS mobile identity, resulting in slice reference overflow.

Vulnerability class: Buffer Overflow

Published 2025-09-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (33.5th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 33.5% 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: 0.004 · change: 0.000

Affected products

Free5gc — versions 4.0.1

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

github.com/free5gc/free5gc/issues/690 (Exploit, Patch, Issue Tracking)
gist.github.com/DDGod2025/532691e3e2db9b47c67c3d153c026e62 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2025-56394?: CVE-2025-56394 is a high-severity vulnerability in Free5gc, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2025-09-23.
How severe is CVE-2025-56394?: High severity. CVSS v3 base score is 7.5 out of 10.