CVE-2026-4240

MEDIUM

Open5GS CCA smf_s6b_sta_cb denial of service

Title source: cna
STIX 2.1

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.

References (8)

Core 8
Core References
Vdb Entry, Technical Description vdb-entry technical-description
VDB-351182 | Open5GS CCA smf_s6b_sta_cb denial of service
https://vuldb.com/?id.351182
Signature, Permissions Required signature permissions-required
VDB-351182 | CTI Indicators (IOB, IOC, TTP, IOA)
https://vuldb.com/?ctiid.351182
Third Party Advisory third-party-advisory
Submit #771361 | Open5GS MME v2.7.6 Improper Authentication
https://vuldb.com/?submit.771361
Issue Tracking issue-tracking
https://github.com/open5gs/open5gs/issues/4343

Scores

CVSS v3 5.3
EPSS 0.0053
EPSS Percentile 40.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-404
Status published
Products (9)
n/a/Open5GS 2.7.0
n/a/Open5GS 2.7.1
n/a/Open5GS 2.7.2
n/a/Open5GS 2.7.3
n/a/Open5GS 2.7.4
n/a/Open5GS 2.7.5
n/a/Open5GS 2.7.6
n/a/Open5GS 2.7.7
open5gs/open5gs < 2.7.7
Published Mar 16, 2026
Tracked Since Mar 16, 2026