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Description

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 be initiated remotely. The exploit has been publicly disclosed and may be utilized. Upgrading to version 2.7.7 is sufficient to fix this issue. Patch name: 80eb484a6ab32968e755e628b70d1a9c64f012ec. Upgrading the affected component is recommended.

PUBLISHED Reserved 2026-03-15 | Published 2026-03-16 | Updated 2026-03-16 | Assigner VulDB




MEDIUM: 6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
MEDIUM: 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
MEDIUM: 5.3CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
5.0AV:N/AC:L/Au:N/C:N/I:N/A:P/E:POC/RL:OF/RC:C

Problem types

Denial of Service

Timeline

2026-03-15:Advisory disclosed
2026-03-15:VulDB entry created
2026-03-15:VulDB entry last update

Credits

ZiyuLin (VulDB User) reporter

References

vuldb.com/?id.351182 (VDB-351182 | Open5GS CCA smf_s6b_sta_cb denial of service) vdb-entry technical-description

vuldb.com/?ctiid.351182 (VDB-351182 | CTI Indicators (IOB, IOC, TTP, IOA)) signature permissions-required

vuldb.com/?submit.771361 (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/...ommit/80eb484a6ab32968e755e628b70d1a9c64f012ec patch

github.com/open5gs/open5gs/releases/tag/v2.7.7 patch

github.com/open5gs/open5gs/ product

cve.org (CVE-2026-4240)

nvd.nist.gov (CVE-2026-4240)

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