CVE-2026-33063

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{"affected": [{"affectedData": [{"product": "ausf", "vendor": "free5gc", "versions": [{"status": "affected", "version": "< 1.4.2"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:*", "matchCriteriaId": "F7D53A8E-777B-4DD7-898E-7EE90ED6D37A", "versionEndExcluding": "1.4.2", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "free5GC is an open source 5G core network. free5GC AUSF prior to version 1.4.2 has is an Improper Null Check vulnerability leading to Denial of Service. All deployments of free5GC v4.0.1 using the AUSF UE authentication service (`/nausf-auth/v1/ue-authentications` endpoint) are affected. A remote attacker can cause the AUSF service to panic and crash by sending a crafted UE authentication request that triggers a nil interface conversion in the `GetSupiFromSuciSupiMap` function. This results in complete denial of service for the AUSF authentication service. The `GetSupiFromSuciSupiMap` function attempts to perform an interface conversion from `interface{}` to `*context.SuciSupiMap` without checking if the underlying value is nil. When `SuciSupiMap` is nil, the code panics with \"interface conversion: interface {} is nil, not *context.SuciSupiMap\". free5GC AUSF version 1.4.2 patches the issue. There is no direct workaround at the application level. The recommendation is to apply the provided patch or restrict access to the AUSF API to trusted sources only."}, {"lang": "es", "value": "free5GC es una red central 5G de c\u00f3digo abierto. free5GC AUSF anterior a la versi\u00f3n 1.4.2 tiene una vulnerabilidad de verificaci\u00f3n de nulos incorrecta que conduce a la denegaci\u00f3n de servicio. Todas las implementaciones de free5GC v4.0.1 que utilizan el servicio de autenticaci\u00f3n de UE de AUSF (el endpoint '/nausf-auth/v1/ue-authentications') est\u00e1n afectadas. Un atacante remoto puede causar que el servicio AUSF entre en p\u00e1nico y falle al enviar una solicitud de autenticaci\u00f3n de UE manipulada que activa una conversi\u00f3n de interfaz nula en la funci\u00f3n 'GetSupiFromSuciSupiMap'. Esto resulta en una denegaci\u00f3n de servicio completa para el servicio de autenticaci\u00f3n de AUSF. La funci\u00f3n 'GetSupiFromSuciSupiMap' intenta realizar una conversi\u00f3n de interfaz de 'interface{}' a '*context.SuciSupiMap' sin verificar si el valor subyacente es nulo. Cuando 'SuciSupiMap' es nulo, el c\u00f3digo entra en p\u00e1nico con 'interface conversion: interface {} is nil, not *context.SuciSupiMap'. free5GC AUSF versi\u00f3n 1.4.2 parchea el problema. No hay una soluci\u00f3n alternativa directa a nivel de aplicaci\u00f3n. La recomendaci\u00f3n es aplicar el parche proporcionado o restringir el acceso a la API de AUSF solo a fuentes confiables."}], "id": "CVE-2026-33063", "lastModified": "2026-06-17T10:36:53.220", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.7, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-33063", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-20T16:35:57.018620Z", "version": "2.0.3"}}]}, "published": "2026-03-20T03:16:01.260", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/free5gc/ausf/commit/3b9ac4403c2756dc89a5ed3cdcefe688458588aa"}, {"source": "security-advisories@github.com", "tags": ["Issue Tracking", "Patch"], "url": "https://github.com/free5gc/ausf/pull/52"}, {"source": "security-advisories@github.com", "tags": ["Issue Tracking"], "url": "https://github.com/free5gc/free5gc/issues/778"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/free5gc/free5gc/security/advisories/GHSA-4jrw-92fg-4jwx"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.4.2)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "product": "ausf", "vendor": "free5gc"}], "analysis": {"en": {"generated_at": "2026-03-27T18:26:56.203465+00:00", "value": {"mitigation_remediation": ["Upgrade free5GC AUSF to version 1.4.2 or later", "Restrict access to the /nausf-auth/v1/ue-authentications endpoint to trusted sources using firewall or network isolation"], "summary": {"action": "Apply Patch", "impact": "Denial of Service via AUSF crash"}, "threat_synthesis": {"affected_systems": "Affected deployments are all free5GC core networks running AUSF versions earlier than 1.4.2, including the long\u2011term support release free5GC v4.0.1. The vulnerability resides in the AUSF component of the free5GC suite and impacts the UE authentication service. Upgrading to AUSF 1.4.2 or later resolves the issue.", "description_and_impact": "The vulnerability arises from an improper null check in the GetSupiFromSuciSupiMap function of the AUSF UE authentication service. When the function attempts an interface conversion on a nil value, the service panics with \"interface conversion: interface {} is nil, not *context.SuciSupiMap\". This panic terminates the AUF service, causing a denial of service for all authentication requests that hit the /nausf-auth/v1/ue-authentications endpoint.", "risk_and_exploitability": "The CVSS score of 8.7 indicates high severity, although the EPSS score of less than 1% suggests the likelihood of exploitation is low at present. The vulnerability is not listed in CISA's KEV catalog. An attacker can trigger the crash by sending a crafted UE authentication request from a remote source, implying a network\u2011based attack vector. Mitigation requires applying the vendor patch or otherwise blocking external access to the AUSF authentication API."}}}}, "created": "2026-03-20T08:52:57.803973+00:00", "updated": "2026-03-27T20:26:48.490019+00:00", "vendors": ["free5gc", "free5gc$PRODUCT$ausf"]}