CVE-2025-15530
Published: 17 January 2026
Summary
CVE-2025-15530 is a medium-severity Reachable Assertion (CWE-617) vulnerability in Open5Gs Open5Gs. Its CVSS base score is 5.5 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 18.2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2025-15530 is a vulnerability in Open5GS up to version 2.7.6, specifically affecting the function sgwc_s11_handle_create_indirect_data_forwarding_tunnel_request in the file /src/sgwc/s11-handler.c. It manifests as a reachable assertion (CWE-617), which can be triggered remotely. The vulnerability carries a CVSS v3.1 base score of 5.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L), indicating medium severity primarily impacting availability.
A remote attacker requires no privileges, authentication, or user interaction and can exploit the issue over the network with low attack complexity. Successful manipulation triggers the assertion, resulting in a denial of service condition. The exploit has been publicly disclosed and may be utilized by attackers.
Advisories indicate the issue is already fixed, with details documented in the Open5GS GitHub repository, including issue #4231 and related comments. Security practitioners should upgrade to Open5GS versions beyond 2.7.6 incorporating the patch. Further details are available via VulDB entries at the provided references.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-3138
Vulnerability details
A vulnerability was determined in Open5GS up to 2.7.6. This affects the function sgwc_s11_handle_create_indirect_data_forwarding_tunnel_request of the file /src/sgwc/s11-handler.c. Executing a manipulation can lead to reachable assertion. The attack can be executed remotely. The exploit has been publicly disclosed and may…
more
be utilized. The issue report is flagged as already-fixed.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Remote unauthenticated exploitation of a network-exposed service (Open5GS SGW-C) triggers a reachable assertion crash, directly enabling T1190 for initial access and T1499.004 for endpoint DoS via application exploitation.
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Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires timely application of the vendor patch that resolves the reachable assertion in sgwc_s11_handle_create_indirect_data_forwarding_tunnel_request.
Mandates validation of all input to the S11 handler, preventing the malformed tunnel-request data that triggers the assertion.
Requires mechanisms to protect against or limit denial-of-service conditions caused by assertion failures in network elements such as Open5GS SGW-C.