CVE-2026-4988
Open5GS CCA Message smf_s6b denial of service
- State
- Published
- Severity
- 6.3 Medium
- Published
- Mar 27, 2026
- Updated
- Mar 30, 2026
- Reserved
- Mar 27, 2026
Description
A security flaw has been discovered in Open5GS 2.7.6. This issue affects the function smf_gx_cca_cb/smf_gy_cca_cb/smf_s6b of the component CCA Message Handler. The manipulation results in denial of service. The attack may be launched remotely. Attacks of this nature are highly complex. The exploitability is assessed as difficult. The exploit has been released to the public and may be used for attacks.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.3 Medium | CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P | VulDB |
| 3.1 | 3.7 Low | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R | VulDB |
| 3.0 | 3.7 Low | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R | VulDB |
| 2.0 | 2.6 Low | AV:N/AC:H/Au:N/C:N/I:N/A:P/E:POC/RL:ND/RC:UR | VulDB |
Weaknesses
- CWE-404 Denial of Service
Affected Products
| Product | Versions |
|---|---|
Open5GSn/a |
|
References
- VDB-353875 | Open5GS CCA Message smf_s6b denial of servicevdb-entrytechnical-description
- VDB-353875 | CTI Indicators (IOB, IOC, TTP, IOA)signaturepermissions-required
- Submit #771349 | Open5GS SMF v2.7.6 Denial of Servicethird-party-advisory
- https://github.com/open5gs/open5gs/issues/4342issue-tracking
- https://github.com/open5gs/open5gs/issues/4342#issue-4021772232exploitissue-tracking
- https://github.com/open5gs/open5gs/product
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