CVE-2025-65562 Integer overflow in n/a
An unauthenticated remote attacker can crash the free5GC UPF by sending a PFCP request with a large SEID, causing an integer underflow and panic.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-65562?
CVE-2025-65562 is a high-severity vulnerability in Free5gc Free5gc, published on 18 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-129
Which versions are affected by CVE-2025-65562?
It affects 1 product.
Products include Free5gc Free5gc.
How do I fix CVE-2025-65562?
No fix has been published for CVE-2025-65562 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-65562 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-65562 exists.
Other vulnerabilities in Free5gc Free5gc
- CVE-2026-44327 free5GC: NEF nnef-oam route group is unauthenticated; no-token requests reach the OAM handler
- CVE-2026-44329 free5GC's SMF UPI management interface lacks auth middleware; unauthenticated topology read/write requests reach handlers
- CVE-2026-44330 free5GC's NEF nnef-pfdmanagement API is unauthenticated; forged bearer tokens can read PFD data and create/delete PFD subscriptions
- CVE-2025-63679 Memory corruption in n/a
- CVE-2026-44315 free5GC's NEF 3gpp-pfd-management API is unauthenticated; forged bearer tokens can create, read, and delete PFD transactions
Sources
Also known as GHSA-7jcm-x89q-2vg2.