CVE-2026-4240

MEDIUM

Open5GS CCA smf_s6b_sta_cb denial of service

Title source: cna

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)

[Vdb Entry, Technical Description] https://vuldb.com/?id.351182

[Signature, Permissions Required] https://vuldb.com/?ctiid.351182

[Third Party Advisory] https://vuldb.com/?submit.771361

[Issue Tracking] https://github.com/open5gs/open5gs/issues/4343

[Exploit] https://github.com/open5gs/open5gs/issues/4343#issue-4021871895

[Patch] https://github.com/open5gs/open5gs/commit/80eb484a6ab32968e755e628b70d1a9c64f012ec

View Patch ZIP pw:eip

[Patch] https://github.com/open5gs/open5gs/releases/tag/v2.7.7

[Product] https://github.com/open5gs/open5gs/

Scores

CVSS v3 5.3

EPSS 0.0007

EPSS Percentile 21.7%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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