# CVE-2025-15686

## Summary

- **CVE ID:** CVE-2025-15686
- **Severity:** MEDIUM
- **CVSS Score:** 5.3 (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P)
- **CWE:** CWE-404
- **Published:** Aug 12, 2026
- **Last Modified:** Aug 12, 2026

## 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

- n/a — Open5GS (2.7.0)
- n/a — Open5GS (2.7.1)
- n/a — Open5GS (2.7.2)
- n/a — Open5GS (2.7.3)
- n/a — Open5GS (2.7.4)
- n/a — Open5GS (2.7.5)
- n/a — Open5GS (2.7.6)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.30%
- **EPSS Percentile:** 23.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._