CVE-2025-15539: OPEN5GS

High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days.

A vulnerability was determined in Open5GS up to 2.7.6. Impacted is the function sgwc_s11_handle_downlink_data_notification_ack of the file src/sgwc/s11-handler.c of the component sgwc. This manipulation causes denial of service. The attack can be initiated remotely. The exploit has been publicly disclosed and may be utilized. Patch name: b4707272c1caf6a7d4dca905694ea55557a0545f. To fix this issue, it is recommended to deploy a patch. The issue report is flagged as already-fixed.

Affected products

• OPEN5GS OPEN5GS: up to and including 2.7.6

Published 2026-01-19. Last modified 2026-06-17.