Vulnerability in Open5gs
CVE-2026-4240
A vulnerability was determined in Open5GS up to 2.7.6. The affected element is the function smf_gx_cca_cb/smf_gy_cca_cb/smf_s6b_aaa_cb/smf_s6b_sta_cb of the component CCA Handler. This manipulation causes denial of service. The attack can…
EPSS: 0.001 (27.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C.
Affected products
- N/a Open5gs — versions 2.7.0, 2.7.1, 2.7.2
Weakness classification (CWE)
References
- VDB-351182 | Open5GS CCA smf_s6b_sta_cb denial of service (vdb-entry, technical-description)
- VDB-351182 | CTI Indicators (IOB, IOC, TTP, IOA) (signature, permissions-required)
- Submit #771361 | Open5GS MME v2.7.6 Improper Authentication (third-party-advisory)
- github.com/open5gs/open5gs/issues/4343 (issue-tracking)
- github.com/open5gs/open5gs/issues/4343 (exploit, issue-tracking)
- github.com/open5gs/open5gs/commit/80eb484a6ab32968e755e628b70d1a9c64f012ec (patch)
- github.com/open5gs/open5gs/releases/tag/v2.7.7 (patch)
- github.com/open5gs/open5gs/ (product)
Frequently asked questions
- What is CVE-2026-4240?
- CVE-2026-4240 is a medium-severity vulnerability in Open5gs, classified under Improper Resource Shutdown or Release. CVSS score: 5.3/10. Published 2026-03-16.
- How severe is CVE-2026-4240?
- Medium severity. CVSS v3 base score is 5.3 out of 10.