What is the CVSS score of CVE-2026-4240?

CVE-2026-4240 has a CVSS 3.1 base score of 5.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L. EPSS exploitation probability: 0.1%.

Which versions of Open5gs are affected by CVE-2026-4240?

Organizations using Open5GS should be aware of moderate risk from CVE-2026-4240 rated CVSS 5.3. Exploitation could compromise the security of affected deployments.

Open5gs CVE-2026-4240

EUVD-2026-12433 MEDIUM

Improper Resource Shutdown or Release (CWE-404)

2026-03-16 cna@vuldb.com

Denial Of Service Open5gs

5.3

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.3 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Lifecycle Timeline

EUVD ID Assigned

Mar 16, 2026 - 14:30 euvd

EUVD-2026-12433

Analysis Generated

Mar 16, 2026 - 14:30 vuln.today

CVE Published

Mar 16, 2026 - 14:20 nvd

MEDIUM 5.3

DescriptionCVE.org

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.

AnalysisAI

Denial of service in Open5GS through version 2.7.6 affects the CCA Handler component's callback functions, allowing unauthenticated remote attackers to crash the service. Public exploit code is available for this vulnerability. …

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Vulnerability AssessmentAI

Risk Assessment	Service disruption affecting availability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An attacker sends specially crafted requests that cause excessive resource consumption (CPU, memory, disk) or trigger a crash in the target application.
Remediation	Implement rate limiting and input validation. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 30 days: Identify affected systems running Open5GS and apply vendor patches as part of regular patch cycle. …

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CVE-2026-4240 vulnerability details – vuln.today

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Open5gs CVE-2026-4240

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

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