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 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.

CVSS v3 5.3 MEDIUM
CVSS v2.0 5.0 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

5.0^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:L/Au:N/C:N/I:N/A:P

Exploitability : 10.0 / Impact : 2.9

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

References

Link	Resource
https://github.com/open5gs/open5gs/	Product
https://github.com/open5gs/open5gs/commit/80eb484a6ab32968e755e628b70d1a9c64f012ec	Patch
https://github.com/open5gs/open5gs/issues/4343	Issue Tracking Third Party Advisory
https://github.com/open5gs/open5gs/issues/4343#issue-4021871895	Exploit Issue Tracking Third Party Advisory
https://github.com/open5gs/open5gs/releases/tag/v2.7.7	Release Notes
https://vuldb.com/?ctiid.351182	Permissions Required VDB Entry
https://vuldb.com/?id.351182	Third Party Advisory VDB Entry
https://vuldb.com/?submit.771361	Exploit Third Party Advisory VDB Entry

Configurations

Configuration 1 (hide)

cpe:2.3:a:open5gs:open5gs:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-03-16 14:20

Updated : 2026-03-20 18:15

NVD link : CVE-2026-4240

Mitre link : CVE-2026-4240

CVE.ORG link : CVE-2026-4240

JSON object : View

Products Affected

open5gs

open5gs

CWE

CWE-404

Improper Resource Shutdown or Release

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