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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.2.0"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "n/a", "source": "cna", "vendor": "n/a"}, "product": "oai-cn5g-ausf", "vendor": "openairinterface"}], "analysis": {"en": {"generated_at": "2026-04-14T18:05:53.693669+00:00", "value": {"mitigation_remediation": ["Upgrade OpenAirInterface to the latest available version that resolves the buffer overflow issue.", "Check for and apply any vendor\u2011supplied patches or hotfixes for the CN5G AMF component.", "If an upgrade is not immediately possible, isolate the AMF/AUSF functions from untrusted traffic or implement ingress filtering to reject malformed Authentication Response messages.", "Monitor system logs for repeated crashes or anomalous authentication attempts that could indicate exploitation attempts.", "Keep the network functions updated and conduct periodic security reviews following the latest advisories from the OpenAirInterface project."], "summary": {"action": "Apply Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "The vulnerability affects the OpenAirInterface CN5G AMF component, specifically version 2.2.0. No other versions are listed as impacted.", "description_and_impact": "A buffer overflow occurs in OpenAirInterface Version 2.2.0 when the AMF processes an Oversized Authentication Response within a UplinkNASTransport. The oversized PDU is decoded by the AMF and then forwarded to AUSF, where it triggers a crash. The resulting crash prevents users from completing registration and verification, leading to a denial of service for the affected network functions.", "risk_and_exploitability": "The CVSS score of 7.5 indicates a high severity with a substantial impact on availability. The EPSS score below 1% suggests current exploitation attempts are unlikely, and it is not listed in the CISA KEV catalog. Based on the description, the likely attack vector is a crafted Authentication Response packet sent from the network or a compromised UE to the AMF; this requires network access to the AMF/AUSF communication path."}}}}, "created": "2026-04-08T19:44:36.036905+00:00", "updated": "2026-04-15T16:15:11.956058+00:00", "vendors": ["openairinterface", "openairinterface$PRODUCT$oai-cn5g-ausf"]}