CVE-2025-15687

Open5GS SMF Diameter Gx Credit-Control-Answer smf_gx_cca_cb denial of service

State: Published
Severity: 5.3 Medium
Published: Aug 12, 2026
Updated: Aug 12, 2026
Reserved: Aug 9, 2026

Description

A security flaw has been discovered in Open5GS up to 2.7.6. Impacted is the function smf_gx_cca_cb of the component SMF Diameter Gx Credit-Control-Answer Handler. The manipulation results in denial of service. The attack can be launched remotely. The exploit has been released to the public and may be used for attacks. Upgrading to version 2.7.7 is recommended to address this issue. The patch is identified as f23d7a5e959acd8f37b925dc29b85f26b7d391cb. Upgrading the affected component is advised.

Scores

CVSS	Score	Vector	Source
4.0	5.3 Medium	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	VulDB
3.1	4.3 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C	VulDB
3.0	4.3 Medium	CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C	VulDB
2.0	4.0 Medium	AV:N/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:OF/RC:C	VulDB

Weaknesses

CWE-404 Denial of Service

Affected Products

Product	Versions
Open5GSn/a	2.7.0Affected 2.7.1Affected 2.7.2Affected 2.7.3Affected 2.7.4Affected 2.7.5Affected 2.7.6Affected 2.7.7Not affected

References

VDB-387283 | Open5GS SMF Diameter Gx Credit-Control-Answer smf_gx_cca_cb denial of servicevdb-entrytechnical-description
VDB-387283 | CTI Indicators (IOB, IOC, TTP, IOA)signaturepermissions-required
CVE-2025-15687 | CVE Analysis and Reportthird-party-advisory
Submit #867119 | Open5GS v2.7.5 Denial of Servicethird-party-advisory
https://github.com/open5gs/open5gs/issues/4027issue-tracking
https://github.com/open5gs/open5gs/pull/4034issue-trackingpatch
https://github.com/user-attachments/files/21515527/SMF.crashes.zipexploit
https://github.com/open5gs/open5gs/commit/f23d7a5e959acd8f37b925dc29b85f26b7d391cbpatch
https://github.com/open5gs/open5gs/releases/tag/v2.7.7patch
https://github.com/open5gs/open5gs/product

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