EUVD-2026-67109
GHSA-j7q9-vcmw-q426
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-reachable SBI HTTP endpoint, no auth required per handler design, availability-only impact with no confidentiality or integrity effect.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
Improper Input Validation in the HTTPModifySubscription handler of free5gc v4.0.1 allows attackers to cause a Denial of Service (DoS) via a crafted input.
AnalysisAI
Denial of service in free5gc v4.0.1 is exploitable via the HTTPModifySubscription handler, which fails to reject crafted HTTP input before processing, causing the affected 5G core network function to crash. The CVSS vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) confirms remote, unauthenticated exploitation with no user interaction required, making any network-reachable deployment of the SBI interface a viable target. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must have network-level access to the free5gc Service Based Interface (SBI) HTTP endpoint that exposes the HTTPModifySubscription handler - this is the specific handler identified in the CVE description as the vulnerable component. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.5 score is technically justified - AV:N/AC:L/PR:N/UI:N means any host with network access to the SBI can trigger the crash without credentials or interaction. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Operators should monitor the upstream GitHub issue at https://github.com/free5gc/free5gc/issues/754 for a patch release, as no explicitly versioned fix is confirmed in the available data; the patch status is 'upstream issue filed, patched release not independently confirmed.' Until a fix is released, the most effective compensating control is network segmentation: ensure the free5gc SBI HTTP interfaces are bound only to internal trust-domain interfaces and are not reachable from untrusted networks or the internet, using firewall rules or network policy to restrict access to known NF peer addresses only. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all free5gc v4.0.1 deployments and document whether the HTTPModifySubscription handler SBI interface is network-accessible from untrusted networks. …
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Same weakness CWE-20 – Improper Input Validation
View allSame technique Denial Of Service
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External POC / Exploit Code
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