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CVE-2026-4240

MEDIUM CVSS 4.0: 5.5 EPSS 0.07%
Updated Mar 20, 2026
Open5Gs
Parameter Value
CVSS 5.5 (MEDIUM)
Affected Versions before 2.7.7
Fixed In 2.7.7
Type CWE-404 (Improper Resource Shutdown or Release)
Vendor Open5Gs
Public PoC No

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.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
Low
Partial disruption

CVSS Vector v4.0

Vulnerable Products 1

Configuration From (including) Up to (excluding)
Open5gs Open5gs
cpe:2.3:a:open5gs:open5gs:*:*:*:*:*:*:*:*
2.7.7