Vulnerability in Free5gc
CVE-2025-65562
The free5GC UPF suffers from a lack of bounds checking on the SEID when processing PFCP Session Deletion Requests. An unauthenticated remote attacker can send a request with a very large SEID (e.g., 0xFFFFFFFFFFFFFFFF) that causes an integer conversion/underflow in LocalNode.DeleteSess() / LocalNode.Sess() when a uint64 SEID is converted to int and used in index arithmetic. This leads to a negative index into n.sess and a Go runtime panic, resulting in a denial of service (UPF crash). The issue has been reproduced on free5GC v4.1.0 with crashes observed in the session lookup/deletion path in internal/pfcp/node.go; other versions may also be affected. No authentication is required.
Published · last modified .
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: 0.006 (44.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: -0.000
Affected products
- Free5gc — versions 4.1.0
Weakness classification (CWE)
References
- github.com/free5gc/free5gc/issues/731 (Exploit, Third Party Advisory, Issue Tracking)
Frequently asked questions
- What is CVE-2025-65562?
- CVE-2025-65562 is a high-severity vulnerability in Free5gc, classified under Improper Validation of Array Index. CVSS score: 7.5/10. Published 2025-12-18.
- How severe is CVE-2025-65562?
- High severity. CVSS v3 base score is 7.5 out of 10.