CVE-2025-65562High· 7.5▾ TwilightThe 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 int…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.6%
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.
free5gc = 4.1.0Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
CVE-2025-65561High· 7.5An issue was discovered in function LocalNode.Sess in free5GC 4.1.0 allowing attackers to cause a denial of service or other unspecified impacts via crafted header Local SEID to the PFCP Session Modification Request.
CVE-2026-94043Medium· 5.3A vulnerability was determined in Free5GC up to 4.2.3
CVE-2026-47780Medium· 6.9free5GC is an open-source implementation of the 5G core network
CVE-2023-2008High· 8.2A flaw was found in the Linux kernel's udmabuf device driver, within a fault handler
CVE-2026-55785Low· 3.7free5GC is an open-source implementation of the 5G core network
CVE-2026-55784High· 7.5free5GC is an open-source implementation of the 5G core network