CVE-2022-39063: OPEN5GS

High severity, CVSS 7.5. EPSS: 1.2% chance of exploitation in the next 30 days.

When Open5GS UPF receives a PFCP Session Establishment Request, it stores related values for building the PFCP Session Establishment Response. Once UPF receives a request, it gets the f_teid_len from incoming message, and then uses it to copy data from incoming message to struct f_teid without checking the maximum length. If the pdi.local_f_teid.len exceeds the maximum length of the struct of f_teid, the memcpy() overwrites the fields (e.g., f_teid_len) after f_teid in the pdr struct. After parsing the request, the UPF starts to build a response. The f_teid_len with its overwritten value is used as a length for memcpy(). A segmentation fault occurs, as a result of a memcpy(), if this overwritten value is large enough.

Affected products

• OPEN5GS OPEN5GS: up to and including 2.4.9

Published 2022-09-16. Last modified 2026-06-17.