When Open5GS UPF receives a PFCP Session Establishment Request, it stores related values for building the PFCP Session Establishment Respon…

published 2022-09-16 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-41609

cvss: 7.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.2%; EPSS 1.2% chance of exploitation in 30 days, percentile 68%
public exploits: 0; none known

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.

Exploit prediction

1.21% chance of exploitation in the next 30 days, higher than 68% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

synopsys.com https://www.synopsys.com/blogs/software-security/cyrc-advisory-open5gs/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Open5GS Open5GS

Classification

Weakness

CWE-676 Use of Potentially Dangerous Function

References

synopsys.com /blogs/software-security/cyrc-advisory-open5gs/
exploit, third-party-advisory

Sources

CVE List CVE-2022-39063
NVD CVE-2022-39063

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Summary