CVE-2025-15686: Open5GS HSS Service fd_msg_sess_get denial of service

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-12 · updated 2026-09-29
Weakness: CWE-404

Description

A vulnerability has been found in Open5GS up to 2.7.6. Affected by this issue is the function fd_msg_sess_get of the component HSS Service. Such manipulation of the argument Session-Id leads to denial of service. The attack may be performed from remote. The exploit has been disclosed to the public and may be used. The project locked and limited conversation to collaborators.

Affected products

Open5GS: 2.7.0, 2.7.1, 2.7.2, 2.7.3, 2.7.4, 2.7.5 (+1)

References

https://github.com/open5gs/open5gs/
https://github.com/open5gs/open5gs/issues/4190
https://github.com/user-attachments/files/23847497/HSS_ULR_error_poc.pcapng.zip
https://vuldb.com/cve/CVE-2025-15686
https://vuldb.com/submit/867104
https://vuldb.com/vuln/387279
https://vuldb.com/vuln/387279/cti

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