What is CVE-2025-63679?

CVE-2025-63679 is a high-severity vulnerability in Free5gc, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2025-11-12.

How severe is CVE-2025-63679?

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

Buffer overflow in Free5gc

CVE-2025-63679

free5gc v4.1.0 and before is vulnerable to Buffer Overflow. When AMF receives an UplinkRANConfigurationTransfer NGAP message from a gNB, the AMF process crashes.

Vulnerability class: Buffer Overflow

Published 2025-11-12 · 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 (31.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 31.6% 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

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

github.com/free5gc/free5gc/issues/725 (Exploit, Issue Tracking)
gist.github.com/DDGod2025/5483d94b028d7a0c111ca23844e8a94d (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2025-63679?: CVE-2025-63679 is a high-severity vulnerability in Free5gc, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2025-11-12.
How severe is CVE-2025-63679?: High severity. CVSS v3 base score is 7.5 out of 10.